Shedding with long hair is a bit of a nightmare, but the good news is that even a few mm of hair regrowth at the scalp level will improve the appearance and thickness of your hair across the hair growth area of your head. Obviously the parts that grow past the hair growth area will still look thin, they'll take much longer to thicken up, but you'd be surprised how little that matters as long as your scalp has good coverage and decent thickness. I'd say it was worse for 6 weeks, depressingly so, then about the same for 6 weeks, and from their noticable improvement.
I'm a bit worried about my hair again atm, seeing increased hairfall at 8 months which I hope is a shed, nowhere near baseline, but worrisome all the same, hope it's just a shed, my dandruff is coming back too and finasteride sorted that out for a long time!
minoxidil is a pain to apply, if you have hair, you'll inevitably get some in your hair and waste some. I use the bigger droppers that come with kirkland or folligain minoxidil and squeeze out several larger drops at scalp level at my vertex, left temporal area, right temporal area and central parting. I use it once a day and probably use 4+ml to cover the area as well as possible and account for the minoxidil wasted on my hair. It takes me less time than brushing my teeth, but I don't part my hair and all that stuff, I just do a rough and read application. My hair is a little greasy afterwards and has that bad wet look where your hair looks even worse. When I wake up the next morning though, it actually feels dry and thicker until I wash my hair. I don't really do any styling with mine, but wouldn't imagine it would be a huge issue if you give it time to dry.
No worries, any questions I'm happy to answer. Best of luck qwerty, hope you manage to save that mane!