I have given vaccines in the past, but my SO is reluctant to help, (hold them while I do the vaccines), and I felt a little nervous about it myself so I only did it that one time.
I donated what was left of the vaccines and a box of syringes to the rescuer that helped me get set up on the TNR program. She was happy to have them as she goes out in the field doing rescues and has a lot more to care for. I now have the vet do them all.
FYI, Rabies MUST be given by the vet by law and you cannot buy that vaccine, but you can get all the others that I know about. I understand though that you shouldn't do the FeLuk without the cats first being tested because if they are positive it could cause severe problems.
If you want to do your own, it wou8ld be a good idea to get with a vet that understands and gives you his/her blessings so if you ever have a problem or need some help with your first ones then the vet can help you.
Good Luck with whatever you choose to do.