lewis
Take all the of the adjustment out of the lifter adjustment screws, remove the push rods, remove the bolts that hold down the rocker boxes (no disassembly of the rocker boxes required unless you find a problem though it's a good time to check the rocker arm bushings) then pull the head bolts. If memory serves me right, if the engine is in the frame, the front rocker box will lift out but the rear rocker box will only come out with the head. That's how it worked on my 1975 XLH.
By the way, you need a manual for the bike. It will give you the fine points, torque settings, not to mix the parts when putting things back together and the like.