Procedure will vary depending on model. For a common tilt barrel model, such as the 21 A, see the link listed below for a copy of the owner's manual- which includes instructions. Do NOT try to disassemble more than given in the instructions unless you have a large vocabulary of profanity.
berreta jetfire 950, a .25 acp pistol.
Best left to a gun smith
25-50 USD
gun shops, gun shows, want ads, e-gunparts.com
50 USD
Effective range is 25-50m
Like a Colt 25 auto
You will need the services of a gunsmith
25-100 USD without more of a description
You can try e-gunparts.com and gun shows.
Try e-gunparts.com
25-75 USD