Its not that complicated, just very time consuming. It took me 12 hours first time around.
The most important thing is probably labeling what goes wheres. Put bolts/screws and everything in separate zip lock bags that are labeled.
Make sure to use plenty of RTV on the ridges, I didnt use enough despite thinking I used alot and now have to break everything down again to do 5 mins worth of work.
The rocker arms don't need to come off completely, they just need to be loosened so you can take the pushrods out. Make sure to put them back in the same way they come out because they are different lengths. You can cause damage if you dont.
Also make sure to clean up gasket residue really well before putting in the new gasket.
Last but not least, torque everything to spec and make aboslutely sure to take your time.