It can be wired to the original oven outlet or change it to a single socket. I easy job. The maximum load for a plug head is 3 kw. Just need to may be change the mcb for a correct rated one
You would do the first fix with the wires leave them hanging down before the insulation is fitted it can be signed off then the boards fitted and the lights fitted. You would then test the lights anyone can fit the insulation and boards.