Among the things I've been thinking about doing to my guitar is changing out the machine heads. I've got (I'm pretty sure) the original stock machine heads on my '90ish Gibson LP Standard. They've been OK, but I'm increasing convinced that some wonkiness with the G-string slipping out of tune may be the fault of that machine head.
I'm no techie, but if it's easy enough I could replace these myself. Can I get better quality replacement machine heads that I can just "drop in"? Or are better quality machine heads the sort of thing with which my clueless blundering could screw up the guitar, and are best left to a pro? (When I get my BKPs, I have no intention of trying to solder them in myself, but thought it's possible I might be able to handle machine heads if they were sufficiently basic?)
That having been asked, what are people's opinions on good machine head makes for LP-style guitars? :)