Jointing crooked edges of rough boards entirely by hand is do-able,
First you need to get the edge relatively straight, then refine
it to straight AND square, which is the more skillful part of
I like to do things quickly, so I snap or draw a line on the board
and bandsaw to it. Then I have a sort of straight edge. I'll
clean it up on a powered jointer or use 2 planes to get it sort
of straight - a #4 set for a deep cut with a wide mouth, and
a #5 set for a finer cut.
I lay a 78" level (one of my most used tools) across the edge
to check it for straightness often, taking shavings where
I often finish making the jointed edge with a jack plane,
but I have used a jointer plane sometimes. If you've done the
first stages well the jointer plane isn't necessary - and metal
jointers are quite heavy and will tire you.
I use a pocket square to check the edges every 6" or so... shaving
the edge back to square, and then checking with the level again
to see if I've carved any hollows while squaring.
You can clamp a board to the side of your plane to help keep
it square - but I prefer to work on refining my balance and
getting a keener and keener sense of what is FLAT, STRAIGHT,