Jeremy's is one approach, and a good way to start.
I use the method I named after the fellow who devised it,
The Mellish Technique, after the late Scott Mellish. I wrote the article soon after my meeting with Scott, and he edited the article for me. It is stunningly easy to do & use. A small globular cluster that is just resolving in your eyepiece takes less than 5 minutes, including a myriad of tiny pin points of barely resolved stars.
The sketch I did of Comet Lemmon with 47Tuc took less than thirty minutes to complete. What took longest was the individual stars within the field of view. The cluster & comet less than 15.