Some conclusions drawn from two practice runs with vacuum bagging:
1) Thin vacuum bags work better than thick.
2) Be neat with the masking tape. It becomes your enemy when sliding the bag over the board.
3) I love pre-wetting the cloth on a table. Much neater and less wasteful of resin.
4) A vacuum regulator is much nicer to use than just venting with a needle valve. Safer too, for the board.