Hey! I'm thinking if your purse pieces are already the size you want, then no need to block them. I'd seam them together, and make sure it still looked like the shape/size I want. You may be able to skip blocking altogether! As for lining, you definitely want to do that after seaming.
Is this the bag you posted about the other day because the pieces were the same size? SO CUTE!
*Dream Swatch in Madil Eden Bamboo
On the needles:
*Isabella from Spring Knitty
*Striped hoodie from Nursery Knits
*Tomato from Knitting Daily
I'm hunterjenn on Ravelry. Come find me!