It depends on the starting condition of the timber you're working with. If the pieces you are starting with are reasonably straight, flat and evenly equally dimensioned, then you should be able to just glue them up and work the top by hand to get the thing flat. If you have access to a domino even better as this will allow you to get an even reference side.
It's when the timber is wacky that you run into problems. A lot can be done with a hand plane given the time and energy, but the one thing that's difficult to master is planing a board by hand, or even with an electric plane, to an even thickness (as opposed to just getting one face jointed flat). And if your wood is twisted, or was milled poorly, you will also run into the issue of squaring the sides.