IMHO let the shop do the conversion, they are professionals and will be responsible for any screw ups and can handle any unexpected issues.
If you decide to do it, here are some step by step instructions, pick out how far you want to go. Parts and a kit will vary in price where ever you decide to purchase them.
"There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter." - Hemingway
The greatest ignorance is to reject something you know nothing about.