I usually flatten side A by hand with a scrub plane, flip it over and use the planer to flatten side B, then flip it over again to smooth side A with the planer. For a couple of boards it's faster than messing around with sleds. If time was money I would have a jointer.If it s just for edges you can get by with a table saw easily. The face though. It s possible with a planer to make a sled to flatten a board but it s a lot of bother if you ve got a lot of them to do.
For edges though. When I have longer boards I put them on a piece of plywood with a couple of screws on the edge and use the straightness of the plywood to make that initial edge on the board. Very easy.
- Craftsman on the lake