Steps Time Reference:

0:01 - Materials

0:14 - Print & check sizes for accuracy

0:35 - STEP 1: Separate the long strips

0:54 - STEP 2: Mark one side for scoring

1:33 - STEP 3: Trim the top & bottom

2:00 - STEP 4: Score & fold

2:06 - How to fold using a ruler

2:19 - How to fold using a scoring board/tool

2:49 - STEP 5: Fit check to mark other side

3:23 - STEP 6: Score & fold again

3:30 - Finished sleeve fit check

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Additional tip: If you have a full set of sleeves for the top, bottom and front edges, you may want to trim the corners off the flaps at a 45º angle so the seems line up like a mitered edge instead of overlapping.