-yes, sail deep, but beware of an accidental jibe and never go dead downwind
-maintain speed; the faster you're going the easier it is to get the spin up and down, and you'll be travelling at a speed more similar to the waves
-set and forget both the main AND traveller (note other advice is from 2-up sailors; just set according to conditions) because you'll be waaay too busy with the tiller, spin halyard and spin sheet
-You'll need both hands to hoist the spin quickly (taking quick armfuls of halyard), so you won't be able to sheet in until it's all the way up; once the spin is up, immediately pull just enough sheet to stop any flogging; the boat will power up and naturally be pulled leeward and more downwind (spin will be way out front of the boat); then you can regrab the tiller and adjust your course as you simultaneously fine tune the spin sheeting [all this happens in a spit second and should occur automatically without any thinking on your part; if you have to think about it...in high winds...the daggerboards will be pointing skyward]
-If the sea state is gnarly, prepare to capsize; then you'll be trying to stay with the boat and get the spin snuffed before righting; oh, and if the spinnaker happens to wrap around the mast and diamond wires during the capsize, you'll have to swim out and untangle the mess.

My ability to manage the spinnaker singlehandedly in high winds is quite dependent on the sea state: 25 knots with 1-3 foot waves, no problem; 25 knots with 6+ footers, I'm in trouble; yes, I've taken some lumps trying.

Good luck when you get a spin, Jerry! The spin really supercharges the boat.