How to obtain PC repair/troubleshooting experience?

Find places where you can post ads for free. Computer work and repairs done at reasonable rates. The see what happens. A Laundry Mat is some times a good place for this. Grocery Store bullentin Boards are good places also. This one way to build up experiences and references. A small ad in a local newspaper of some kind also helps. They won't come and break your door down to get a computer fixed, but the exposure for what you do is great. Maybe a University or college would let you post a ad also. Word of mouth travels fast these days. Let your friends and family know what you do and see if they will spread the word around. Best of Luck.