oldbluetrk and coach-frank are right on. I might add one tidbit. Even with sharpen blades etc you need to give the saw time to do its work. Dont' push it faster that it can cut. I use the jig-saw as little as possible. If you use a fine cutting blade it will likely "flare" and the cut will not be "square". If you use a tough thick blade you spend the rest of the evening sanding the rough cut...even if its not seen you want smooth cuts and be sure to prep them good so they won't absorb moisture and split or swell.
I personally like the hollow ground planer blade but it has to have the "set" and sharpen well. good luck. lets us know how it turns out.. i used Oak in my 37 and it still looks nice after 4 years. ....do it once.... do it right
