I can't crochet to save my life, so I'm going to sew my squares together when my blanket is finished.
Because I am sewing them together, do I need to knit an edging on each side of the squares, as I am not good at this either - one side always ends up looking loose which is usually the right side, regardless of what stitch or pattern I am working with.
It is entirely up to you. I usually add a border around each square, but I do it because I like the way it looks.
You don't have to, it is your blanket, you can do whatever you want to with it. Sewing the squares together without adding a border is an entirely reasonable thing to do. So go for it!
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