Supply Teaching 101: What New Teachers Need to Know Before Their First Day
You've signed up with an agency, your first assignment is booked, and now the nerves are creeping in. That's completely normal. Walking into a new school as a supply teacher can feel like starting again every single time. But here's the good news: with the right preparation and the right support around you, your first day can be far more calm than chaotic.
Whether you're an ECT dipping into supply teaching, an experienced teacher enjoying the flexibility, or a cover supervisor and support staff member exploring new roles, this guide walks you through what actually happens before, during, and after your first day - so you know exactly what to expect.
What supply teaching actually involves
Supply teaching means stepping into a school to cover a lesson or a period of absence, for anything from a single day to a full term. You might be:
a daily supply teacher covering one-off absences
a long-term supply teacher taking over a class for weeks
a cover supervisor overseeing lessons
a Learning Support Assistant (LSA) or SEN support worker supporting specific pupils
Each role comes with different responsibilities, but they all share the same core promise: giving pupils a settled, well-managed day and giving the school reliable cover.
Before your first day: the paperwork and compliance
The most important work happens before you ever step foot in the classroom. Every reputable agency will make sure your paperwork is in order long before you're placed - and they should be transparent about it from the start.
Key things to have ready:
a valid Disclosure and Barring Service (DBS) check, or the paperwork to get one
your right-to-work documents and references
your qualifications and teacher registration details where relevant
up-to-date safeguarding training
Good agencies handle the compliance behind the scenes so you're not chasing forms yourself. If an agency is vague about safeguarding or pushes you to start without your checks in place, that's a red flag worth paying attention to. Compliance and safeguarding should always come before placement - never the other way around.
What to pack and how to prepare
You may not know exactly which school you're going to until the day before, so keep a small kit ready to grab:
a notebook and pens - plenty of them
your lunch and a water bottle (staff rooms vary)
a simple printed plan of behaviour strategies you can fall back on
any medication you need, and a spare key or pass details if required
comfortable, professional clothing you can teach confidently in
Most importantly, prepare a simple mental game plan. Schools usually leave cover work, but you can't always rely on it being detailed. Have a few no-prep activities up your sleeve - a quick maths warm-up, a reading round, a short discussion prompt - that work for the age group you're covering.
Inside the classroom: what the day looks like
Arrive early, introduce yourself to the office and a neighbouring teacher, and get the lay of the land: fire exits, toilets, the register, and any SEN or safeguarding notes for individual pupils.
During lessons, be flexible and positive. Pupils are used to supply teachers, so a warm, clear, consistent tone works best. Build rapport quickly, set expectations early, and don't be afraid to move pupils or refocus the room when you need to. At the end of the day, leave a short note for the class teacher about what was covered - it's noticed and appreciated every single time.
Pay, holiday pay, and how it works
Pay is where supply teachers often feel the most uncertainty, and it shouldn't be a mystery. With a good agency, you should know up front how and when you'll be paid, whether you're on PAYE, and that you're entitled to holiday pay and the correct rate for the role you're doing.
Fair, transparent pay matters. You're doing skilled, important work, and you shouldn't have to chase anyone, or haggle, or wait longer than agreed to be paid properly. If an agency is upfront about rates, holiday pay, and payment dates before you start, that's a strong signal they'll treat you with respect throughout.
How the right agency makes the difference
Here's the honest part: not every agency is equal. The best agencies match you to roles that genuinely suit your experience and preferences, communicate calmly and clearly, and back you up if something goes wrong on the day. They don't pressure you, they don't place you somewhere unsuitable just to fill a gap, and they treat you as an educator worth respecting.
That's exactly the approach we take at Pebl Education. We connect educators with suitable roles in primary schools across Essex - from daily and long-term supply to cover supervision, LSA and SEN support, and permanent and fixed-term roles. Our team is calm, clear, and pressure-free, our rates are fixed for schools and competitive for candidates, and we go beyond the minimum when it comes to compliance and safeguarding.
Your first day, handled
Your first supply day doesn't need to be a leap into the unknown. With your paperwork sorted, a small kit ready, a simple plan in your back pocket, and an agency that genuinely has your back, you can walk in prepared, calm, and confident.
If you're an educator looking for a team that respects you, matches you properly, and pays you fairly, we'd love to talk. And if you're a school or trust looking for reliable, vetted supply staff without the chaos, we've got you covered there too.