many ways you could do this, ALL similar to the ways Red, Wayne, And junk describe. All depend on the boat style, size, where it's sitting.
It is 9,000,000x easier to show somebody this operation, than describe it. Lots of things to be done, that can be show in 2 seconds, but would take an hour to describe in type.
If this is a 16' and under, very light boat, it MAY be a single man job. If anything over 16', it must be 2 guys. Not because it is hard, but you have to be 16' apart at the same time, which is hard to do.
If it is a very light boat, hence small, you might be able to use a few cynder-blocks to replace one of these people.