Re: Do I need a guy and a sheet on each side of spinnaker?
Just a couple of things to add.
1) I always keep my main up. I may centre it if it interferes with the wind.
2) Separate sheets and guys are generally found on dip pole spinnakers in which the pole stays attached to the mast and swung through the fore triangle on the gybe. An end for end set up a la ShockT's diagram does not need separate guys. The dip pole is generally used on larger boats and requires a sizable crew.
ISPA Yachtmaster Offshore Instructor Evaluator
CYA Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
As I sail, I praise God, and care not. (Luke Foxe)