Ole, I recently put a VQ trigger and sear in my MKIII. I am not a gunsmith but do have some basic tools. I did a search on this site and rimfirecentral.com and found excellent step by step instructions with pictures. I didn't have any problems and it turned out perfect.
A good friend of mine did the same thing with a 22/45. He removed the mag safety, modified it so he could "slingshot" the bolt, put two set screws in the trigger, and modified the frame so he could put 1911 grips on the gun. He had never modified a gun before and it was his 1st attempt at anything like that. He just took his time, carefully followed the instructions, and didn't get in a hurry. It turned out great. He got his information from rimfirecentral.com. He modified existing parts and did not have to buy a new trigger or sear. If I remember correctly all he needed was a tap and die set, two set screws, a couple of small washer, grip screws, 1911 bushings, and the grips. He bought the gun new and all of the parts for under $300.
The 1911 grips on a 22/45 were a nice touch.