Just pay attention to detail.
The thumb safety blocks the sear from moving. Remove too much metal, you have to start over.
If you do not have the faith to do it yourself, I suggest getting a gunsmith to do it.
Safeties can be done, but make sure it passes the bench tests.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)