All great stuff from Brian72, he knows his stuff. You'll definitely get the feel of when to sharpen. Care for your powerhead is also important. I'd run a 40:1 fuel ratio, let it cool down by idling after cuts, port your muffler if possible to let it breath better. As for size of your mill, the same goes for your powerhead, the bigger the better. Also, you need to keep an eye on your rakers, once I understood them better it has improved my cutting immensely. Read the CS Milling 101, great tips and a lot of discussion about rakers.