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Just so, do I have to sand old stain before restaining?

You don't need to remove all of the old stain to apply darker stain. But you do need to remove all of the lacquer, varnish or anything that will prevent new stain from absorbing into the wood. Your sanding block will initially glide over the old lacquer before it begins to cut into it and remove it.

Also, can you stain wood without sanding? Sanding to repaint or stain cabinets takes a lot of time and energy. Not all staining projects require sanding, especially if you purchase new, already sanded cabinets. However, you can also avoid sanding if you wish to re-stain old cabinets that have no major dents or scratches that need intricate repairs.

Beside this, how much do you need to sand before staining?

On most raw woods, start sanding in the direction of the grain using a #120-150 grit paper before staining and work up to #220 grit paper. Soft woods such as pine and alder: start with #120 and finish with no finer than #220 (for water base stains) and 180 grit for oil base stains.

Can you sand over stain?

you don't need to sand after staining. After the stain is totally dry then apply your first coat of finish and that's when i would sand lightly to knock down any grain raising. Then put on second and third coats of finish without doing any more sanding unless you feel a rough spot anywhere on the finish.