My 235 I rebuilt is on it's stand, and will be hopefully be started soon. It was my first experience too, so first let me say: Good luck!
The only other advice I'd add to what's been said here, is take your time and plan ahead of time. Don't cut corners, because it will hurt you in the long run.
Main things for a rebuild that I did so you have an idea what's in store: Take everything apart and degrease it / clean it thoroughly. Reseat your valves with a suction valve tool and the grinding compound. Replace your piston rings if the pistons are still good. Consider honing the cylinder walls for the pistons, and buy the correct size piston rings. Consider grinding or at the very least polishing the crankshaft. Buy bearings to fit the crankshaft. Buy new pushrods and lifters. If you replace the lifters, it's always a good idea to replace the cam to match with them.
That's just a very general overview to give you an idea, not sure how familiar you are with the engine.
The engine section of the shop manual is completely invaluable with details on how to check and replace each part, but there will still be questions it might not be able to answer. That's why the guys on here are the best, they'll get you fixed up real quick.
Good luck again!
