1st side went fairly well tonight. I spent the most time cleaning all of the old sealant off. I opted for no sealant this time. Just replaced the cylinder base o-ring, the 2 stud o-rings, the pushrod seals, and the head gasket. I kept the piston in the cylinder. Just removed one of the circlips and slid the piston out from the connecting rod. That was the biggest pain. Had to heat it with a hair dryer and give it a little encouragement from the other side.
Of course, I haven't started the thing, so the biggest pain may be yet to come when I'm cleaning a bigger pool of oil from under the bike

As always, thanks for the tips.
Need to adjust the rocker end play before heading to the other side. Also have to replace the valve cover gasket as it ripped when I pulled off the valve cover.