Sorry for double post.
I finally got an Extra on my list of accomplishments, so i guess this makes me an actual Touhou Player rather than a wannabe ?
I started doing PCB now, and i`m getting beat up quite a bit on Stage 5 and 6 losing 2-3 lives on each, i guess this is normal since i came from another game ?
Congratulations on the extra clear!

You may want to just edit in the future instead of double posting. Just a tip.
Is there anything i should know about this game that EoSD didn`t have ?
Well you get lives at amounts of point items rather than pure score amounts I guess.
Oh, and stage practice starts you with max lives, rather than 2 lives/3 bombs, and it's been that way ever since. Thank god. (and you can save replays of stage practice without patching it)
How does the Cherry Mechanic work ? When do the Borders appear ?
Borders appear when you have 50000 Cherry+, which is the top number of the 3 numbers on the bottom. The one that isn't in the hundreds of thousands.
You get Cherry+ by:
Shooting (10x unfocused than focused - don't be suicidal about it, focus when you actually need to dodge)
Cancelling bullets (small Cherry items)
And big/small Cherry items.
You increase your cherrymax by grazing during a border and if you get hit during a border you won't die but the border will end immediately. If you survive until the end of a border you get 10k Cherrymax and also a score bonus of 10 x your Cherrymax or your Cherry/point item value - not 100% sure what one this is.
You can use borders to dodge for as long as you can then cancel it at the end to sort of cheese attacks. Think of it like a flash bomb.
What exactly is Sakuya focused around ? Is she the go-to-choice for Scoring (Since she starts with 4 bombs and a larger graze area) ?
Sakuya is based around screen coverage with moderate damage in various ways - homing, aimed shots, and weaker bombs you can spam.
SakuyaA is arguably the best survival shot, SakuyaB is by far the best scoring shot, though not for the 4 bombs so much though it contributes.
But I'd say don't worry about scoring for now. It's a lot harder than survival.
Will it be harder or easier than EoSD ?
Easier.
Are the hitboxes as infuriating as EoSD or did ZUN fix it ? (Knifes........)
No, he toned down the hitboxes of the most annoying bullets - Knives, Bubbles and the weird medium bullets. The only one I've really had it bad with are Bubbles though. Knives still have weird hitboxes in later games though.
I wish you luck on your quest to 1cc PCB!
Nolegs basically covered that, but grazing during borders does not increase your Cherry+; it increases your Cherry and CherryMax. There is no way to increase Cherry+ when a border is already active-- it'll last 9 seconds regardless.
You saw nothing Karisa :V
Yeah I meant CheryMax. Le Derp.
Didn't know it increased your Cherry, too, though.