The procedure is fairly simple.
Remove the bolt that tighten the two large pins that the engine moves up and down on to engage the belts. The, lightly drive the pin out of one side and swing the motor over using the other pin as a hinge. Then remove the belts and replace. This sounds easier than it really is, but is at least a place to start. Many times, this procedure doesn't work completely so you have to drive out the other pin and remove the engine and then replace the belts and then reinstall the engine and the pins.
I don't think that I have a link to the instructions, but this should help you to at least get you started.
If you don't feel comfortable with this kind of repair I would suggest sending it to a reputable shop.
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