Use the proper head bolt tool - it needs a long shaft to go through the cam towers. I'd leave the camshaft installed to save time. Unbolt the head using the reverse of the tightening sequence, one turn at a time, through the whole pattern. To skip the rail removal, yes, you can cut through the chain. It's faster to pull the head with the exhaust manifold attached, take that off once the head is out of the car. The injectors & prechambers can remain in the head for now.
