I sail a standard P19, (sometimes solo) plus I crew on other P19s, including an MX. I weigh 165. If you have the upgraded rudders, sailing without the jib is an easy option. I put a roller furler on mine, and it works well for the standard sail plan. It's really not an easy option once you have the MX jib, although you can still run a standard jib or run without it.

If you have the old square rudders without the extended gudgeons, your mainsail can easily overpower your rudders and leave you with an uncontrollable boat.

When overpowered, Downhaul, and center the traveler going downwind.