Everything in that video is achievable as long as you aren't a cack handed klutz. 😁
Seriously though, with care and patience you can do everything pretty much as he says in the video. There's a couple of of bits that make me wince but that's just me being fussy. Rubbing in straight lines with your fingertips, in the same direction as your fingers are pointing is a no no, you'll encourage a rippley surface. Use a rubber block with the paper and rub at forty-five degrees to direction the block is facing, ie aim the front edge of the block at twelve o'clock but rub the block towards two o'clock (ish). It stops the edge of the block making lines. For the areas a block isn't suitable use your fingers but keep your hand flat and rub more with pads of your fingers and the area between the two finger joints rather than the tips, also use that same forty-five degree motion as much as possible, or ninety degrees to fingers, never in line with your fingers.
Also stay away from the corners, I know it doesn't have corners but I mean rub the front and back down, then all around the sides and leave the little roundover until last and just give it a tickle with some fine paper, this will be the easiest part to rub through, which you want to avoid.
As with anything, the more care and time you take the better the end result.