If you really want to be lazy, do what my sister (and I) have done. Just quarter the heads, and freeze. Yes, whole just like that. No blanching, no cooking. Now, it isn't great defrosted, but, next time you may corned beef and cabbage, take out the frozen quarters and at it to your baking corned beef for the last 45 minutes to an hour. It's great. fabulous texture and no work involved.