Not too hard as long as they are somewhat mechanically inclined.Be sure to torque in accordance to the manual. Verify timing belt timing over and over before reassembly.Do not keep nuts and bolts anywhere near the timing belt area if the top cover is removed - I dropped a bolt into mine.Easy tip: unbolt and leave the intake manifold IN PLACE. this will save a bit of time disconnecting and reconnecting everything on it.Replace water pump, cam seal, timing belt along with headgasket. If over 200k, replace front crank seal too.Get the FULL headgasket kit that includes valve stem seals and other gaskets. Stem seals are a common wear item on the Hondas and replaceing them now will save a future repair.After all said and done, you should have a motor good for another 150k miles.Note: WHY is the headgasket bad? If it overheated, you probably have a warped cylinder head that will need to be machined back down. This can cost $100-200.