It is true that you can remove the crank from the bottom. In fact, the engine doesn't even have to leave the car

. I would assume you start by removing the oil pan, then the lower part of the connecting rods, then piece by piece from there.
You dont want to reuse the bearings too, so get some fresh ones in there, use assembling grease, and make sure the bearings are in there proper. If not you could

it quick.
Why are you taking out the crank?