If you'll look at the HBI instructions, you'll see that you're really not disassembling any of the more complicated parts of the gun.
1. You're lifting the trigger out by
pushing out (
not "hammering out") one pin. Then you
slide out another pin with a tooth pick.
2. Then you depress the firing pin and pull down the rear of the slide to release the firing pin and exchange the FP spring.
A normal cleaning operation. The first time you do this operation, it might take you 20 whole minutes, max.
? You'll need to be able to do this because 1.
they send several springs, and 2. you need to try all of them with your ammo to know which spring works
best for YOU. So by having a smith do it, you're really (pardon the pun) shooting yourself in the foot.
? At lease try it yourself.
? Take digital photos as you go to help you remember.
? Then start a thread here is you get stumped.