Like Tims quote says, be very consious of side to side pressure. Its pretty easy to egg shap a chamber with the longer reamers. The deeper they are the easier this is to do. its not hard to do, the whole thing will likely be done in 10 minutes!! I didn't have to do a maxi as mine was factory chambered, but I have done a couple others.
I make one complete turn, removed the reamer, blew out the chamber and the reamer, oiled the reamer and repeat. Just GO SLOWLY. You will be a master in no time!!!
CW