I agree with Noah4x4 which is the latest method and it works fine for me and my Nexstar 6SE. when taking long exposure imaging with my DSLR, typically around 90seconds for closer Deep sky nebula, I normally repeat the process a couple of times to fine tune. I totally disagree with Cosmic Geoff who claims the alt/az setup is unsuitable as I have had very acceptable results without spending £ thousands on top end EQ mounts. my mature advice is to spend time on the set up.. Accurately level mount before carefully going through alignment. My first attempt at deep sky on my new wedge was the Whirlpool galaxy, image attached.
cheers
Marty