Why do you want to change them, PITA to get at, just set the piston of the one you want to remove at TDC undo the bolt & pull them out.
You insert a locking bolt into the crank to hold it at TDC, think you best get a Haynes manual or maybe someone can point you in the right direction for a down load, thought there was one on here but can't find it!
Think there's a guy near you ..well finland anyway....on af1 forum who has built a few engines...go over there and ask ..may get more help