It costs a fortune to ship a handgun (must be 'overnight'), then the 'smith costs, so it is pricey.
I suggest taking it apart, cleaniing, lubing the bits that need it except the sear and hammer notch (keep those clean and dry until last). For those put a small dab of automotive 'anti-seize' compound on the hammer notch and assemble.
No metal removal, now you know it is clean and lubed, and go from there to decided if it needs more attention or not.