You can replace the valve stem seals without removing the cylinder head. You can remove the cylinder head easily 'in-car'. A complete rebuild (bearings,rings) requires engine removal--which is not very difficult. The hood opens up vertical. You are better off to remove the engine and transmission together and separate them out of the car.

Rent a portable engine crane (they are made to slip apart for easy transport) from your nearby tool rental place. cost meybe $50 for a day. Buy or rent a good engine stand to bolt the engine on to facilitate the work. It will allow you to rotate the engine so you can get to the 'bottom' bolts easily and see things clearly. You will quickly appreciate the time savings and safety aspects of using the stand--not to mention the cleanliness factor.