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Guesswork really, dont have a tracking setup to use, am stuck with dslr on tripod. i use a trigger grip ball head for easier pointing and adjusting position. Using SkySafari on phone I find the major stars in the sky around what i want to shoot, use binoculars to see more detail. zooming in on phone to my target i try to look for a star pattern close/adjacent to my target, thentry finding that in the sky. usually by triangulation. using both I try to narrow down to something like" its in line with stars X & Y about 1.5x distance as the gap between X & Y. The I try to get camera pointed at that bit of space, if the stars are bright enough i can use live view to position quicker. Then I take a single test shot and zoom in to see if i can find the grouping close to my target, when i'm confident its in shot i can start taking subs. Comets are usually too dim to see in a single sub on camera certainly not by eye but still this approach works. Planning and patience. With a dob style scope its all about star hopping, and a tracking got, get balance correct and use the best refinable star alignment options your mount supports. Plus make certain things meant to be done uptight really are. When using and seting up any gear NEVER say "its close enough" at any step ALWAYS take your time and get everything as perfect as you can, dont use excuses to be lazy, you wont get your target behaving that way.
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