Make sure with the pen-g shots that they do not put the pen-g in the injections since you have to refrigerate these – they will condensate and it will be impossible to use the injection.
My vet usually puts the pen-g in a bottle (it has to be a dark bottle) where I can load my own shots (you have to keep pen-g refrigerated and shake it really well before use) – maybe ask them if they have syringes that the needles come off so you can load the syringe with the pen-g then take the needle off and replace it with a fresh needle to do the injections…usually (at least in my experience) the needle “blunts” a bit when drawing up the pen-g – you also want to make sure that the needle diameter is large enough to allow the pen-g to go through the syringe (it’s pretty thick) – I hope all this makes sense….
Most of this they will probably explain to you when you get your lesson – you will do fine!!!! The first time is the most difficult but the more you do, the more confident you will become.