Blocking a piece of lace really changes the way it looks. This is my recent lace project, unfinished.
Wash the lace in hot water. I wash my lace by hand, with a little liquid dish soap in running water for 2-3 minutes, then rinse in hot water. I wrap the wet lace in a clean dry towel and firmly squeeze the excess water from the lace. I never twist wet lace.
Next I lay a clean pillowcase over my ironing board to protect the lace and keep it clean while it is drying. I pin the edges, gently stretching the lace as I go, until the entire thing is molded to the shape I want and stretched out to snowflake precision.
When the lace is dry, remove the pins. Voila! The lace will hold its shape without pins once it is dry.