Buy some unfinished furniture. Try putting a nice finish on it, including all the requisite sanding, sanding, more sanding, sealing, conditioning, staining, blending, varnishing, steel-wooling, varnishing, more steel wool, more varnish... and when you're done, behold the mediocre results! That's all you'll need to know, to not even bother building your own stuff in the first place. Hey, I'm saving you a fortune in time & tools here!