This deviantart user here, creates quite good hypnosis themed comics. There is one I would like to upload here, but it is 25 pages long. I think that is very exhausting to upload, tag and post each page, one by one.

www.deviantart.com/chainedknee/gallery/

Is there any way to make things quicker? Thanks.

As far as I know? No. But if you plan on uploading a 25 page long comic however, please remember to create a pool and hide images 4-25 (since it's against the rules to mass upload like that)
If you already knew to do that, then sorry for giving you information you already knew

How is it done ? to hide certains images from a pool I mean. That could come in handy.

Just uncheck the "Shown in Index" in the Edit and it won't appear on the front page, but it will still appear if someone searches up the tags. (Example: if it has the blonde_hair tag, it will appear when people search up blonde_hair)