Head clipping and rechambering

search ebay for a cheap used head. search the web or search youtube on how to rechamber. i wouldnt recommend practicing on a good head. once you feel capable and have the right tools required, then you can make the attempt. my 2 cents
 
As long as you have the correct tools. lathe being the biggest etc, and you know how to do match. Pick yourself up a cheap crappy head to practice on and do some homework. Squish clearance, msv, port area, read up on timing etc. There is a good video on this. I think it was forym member joeak47 that did a video with the head on a lathe. Check it out.