Hi and welcome to the site,
I think JK's links pretty well cover it.
I would emphasise that as you tighten up you should always keep checking that the BE is still floating freely fore and aft on the crankshaft. I had a Polish 3/E overhauling a generator unit a few years ago, before he started you could bar the engine over with one hand, I came back from the cargo pump room and he and the fitter had got the head on and both of them were jumping up and down with their feet off the deck, and both hands on the turning bar trying to turn the engine!!!! (so that they couls set the valve clearances)
The engine was moving mm by mm and squeaking as it went. It took me half an hour to persuade them that there was something wrong, they kept insisting that now everything was good because they had fitted new bearings. When I eventually got them to strip down the unit we found a big lump of the old bearing metal adhering to the crankshaft, the new bearing shells had clamped on to it like a brake.
It is always better to ask a stupid question than to do a stupid thing.