Valve Cover Tightening pattern

I always start in the middle and work towards the outside. a 1/4" drive ratchet works and get them snug. If you don't know what too tight is you may need to get a torque wrench. A little common sense will get them just right.
Thanks, That is how I tightened them originally, and figured I had better get a cross over pattern from someone. Thanks for the response Ron D