I just drag it over the bow rail. It's more awkward than heavy, so it's doable. Boat weighs less than 60 lbs. I do use a Garhauer davit to install the small outboard, however, as I can do it from the safety of the cockpit.
I suppose I could make a bar, like Dr Bob did, but it would take some testing to see if our davit actually has enough height/length to get the boat onto the roof. From looking at his pics, his davit seems much taller than ours. I've never tried but I can see the advantage of not wrestling with it on the foredeck.