Head removal help

This is an AMC 360 in an 80 SJ Cherokee, I posted earlier about getting it running. It's sat since 91 and after doing a compression test I found a few cylinders that have 30 lbs or less so I want to pull the heads and take them to a machine shop to be fixed.

While I have replaced a motor in an xj, transmissions, intakes etc I have never messed with heads, a bit apprehensive on pulling them and would like any advice you guys can offer. Perhaps I am thinking it's a bigger deal then it is, none the less it's got me concerned. Just looking for any advice or suggestions that may help.

Thanks