A skipper with whom I sail is capable of launching his Farr 30 by himself; I doubt he likes doing it, but I've seen it done. (Not to worry, I did rush over to help) He has vast experience and practice doing this and we know exactly where the trailer, crane and tie-offs need to go.
For him, it can be dangerous as the trailer needs to be moved out from under the boat before proceeding and the bulb and keel need to fit through a tiny slot at the rear of the trailer... any little wind can mess that up without a guide / watcher to assist the driver.
If you haven't done it before, or if you are uncomfortable enough to ask here, then I'd say don't do it. It shouldn't be difficult to find someone passing by to assist you for 5 minutes. Practice a few hundred times and then you'll be comfortable enough to do it yourself.
Edit: Faster reminded me. The Farr 30 is lifted with a centre hook, not a sling.
Last edited by JordanH; 11-27-2011 at 04:24 PM.