Library paneling is always a nice project to do. The before and after is dramatic. On this particular project the before photos were blurry. The stain we used was provincial by Minwax. With library paneling there is always a lot of sanding to do. Before staining and between coats of finish.
We did not need to precondition the wood but we did use a sealer after staining and three coats of semi gloss pre catalyzed lacquer.
We timed the project so we had a full day for the stain to dry before spraying the lacquer.
Often the biggest challenge when doing this type of work is venting the lacquer fumes out of the property. It is a rather strong smell.