Sewing the sides and bottom together will keep them from curling. But that purse has a flap at the top, doesn't it? So yes, could be some blocking is necessary.
I don't remember what kind of yarn you're using to suggest blocking method. plus I don't make much that needs blocking so my blocking knowledge is poor.
Mirl56 at Ravelry, too.
Learn from the mistakes of others. You canít live long enough to make them all yourself. Eleanor Roosevelt
Lady Feb Sweater
more shawlettes, socks