I checked the different grades descriptions and I do plan to order half of each but the low 3 grade, which should be ok for wallets at least I hope so.
There are no extra costs except of maybe 6 eur or so for shipping and gladly don't have to stock buy that since I'm from Slovakia.
Yeah, I've seen that video, also plan to buy his wallet templates.
I know people generally prefer the Tiger thread (can't remember full name) but I plan to buy some from leathercraftstool, together with the whole equipment (I'm bit tight on a budget, everything including leather needs to be under 200e). Do you think it would be better to contact her or to buy a specific higher grade thread? The one I plan to buy is 4e/48m waxed thread.