IMHO, getting the ends square is the most important. I swear by my new hacksaw mitre box! Wayne Goldman Model 534 Hacksaw Mitre Box
yeah i got a cheap 100 tooth 10inch one on ebay cuts great, but a fine tooth woodworking carbide blade works great as well. Just make sure to square everything up real well and use a nice solid crosscut sled if you have one (if not build one). go slow, wear safety glasses!