quick & fairly easy to do :)
following a handout given by one of my college tutors....
pretty much followin it anyway :)
Once done place this page on top of the other four you folded. place the stack on top of a cutting mat.
align the papers using the table by dropping them a few centimeters above the table in loose fingers then
take a sharp implement (suggest a needle) & pierce a hole through the spine at each of the marked intervals
aim to get the holes to land on the folds you made. for accuracy do this one at a time so they are firmly in line with each other
i did each page individually, using the first one i pierced as an outline to follow the rest by.
fold the cover/jacket in half neatly. touch parallel landscape corners to each other & fold the center.
place your stack of aligned papers into the center of the cover/jacket ensuring that all the folds & holes line up. Carefully pierce the cover ensuring once again that the holes line up with the fold of the cover/jacket.
you are now ready to sew it all together!
starting with the top-hole threat the needle down through the pages & out through the cover (remember to leave enough spare threat on the top to tie it off at the end. bring th needle back up through the next hole along on the cover. you should finish with the needle on the inside of the sketchbook at this point
Repeat the previous step on the proceeding hole weaving up & down until you reach the end. When you reach the end, sew back in the other direction infilling the missing stitches.
You should finish where you first started sewing. At this point tie off the two ends together neatly & trim as desired
get another piece of paper (sugar paper recommended) fold in half. This can be any colour or pattern.
This will be the inside liner for your sketchbook covers
you can either set it on with the signature (stack) or after they've been sewn in then you can stick them down to the initial page & the inside cover.
decorate the cover as desired ^_^