Parts switching
I strongly endorse
Bottom Gun's comment
I'd suggest trying a parts swap yourself before you pay someone to do it. It's not difficult at all.
Given only the simple tools
Art Eatman mentions, you can switch out any part on a 1911 except sights and plunger tube. Oh, yeah, you'd need a smaller drift to punch out the ejector pin.
Sometimes simple parts switching works fine, sometimes not. I bought an Argentine Sistema 1927 a while back. It worked okay, but . . . The old style, broad hammer (forget the grip safety for now) pinched me badly, the trigger pull was hard and gritty, and the magazine catch was far too stiff. Point of impact was six inches left at 25 yards.
Not too bad for a GI pistol, but I'm accustomed to something better. I dug out my little box o' parts and installed an old GI hammer that I'd obtained years ago. I polished the rear end of the trigger bow with thousand-grit emery paper on a smooth marble block and finished up with an Arkansas stone. I replaced the mag catch spring.
I hosed out the receiver interior with carburetor cleaner - - about a third the price of Birchwood Casey Gun Scrubber. Use it only outdoors, the fumes are deadly. Apply a thin coat of oil to prevent rust.
The improvement was dramatic - - Trigger pull weight and crispness. Mag catch far better. No pinch. Ten minutes with Swiss pattern files opened up the tight rear sight, and I drifted it to the right. Hits where I hold it now. Time on project: About two hours. (I was going to the range anyway.)
Best,
Johnny