Other than the cover, I put the outboard in the basement, remove the battery so I can service it, remove most of the cushions, open the lazarette covers and lift the floorboards, and remove sails. Boom stays in cabin with lines attached.
To cover, I have gone through various iterations. This year I have a PVC frame, (hopefully) an improved design from last year. I pull lifelines from stanchions, leaving them coiled in cockpit. 4 in diam PVC drain type pipe goes over the 4 stanchions, about 4 or 5 in above top, resting on deck. 90 degree elbow at top of each lets a length of somewhat smaller (3 in?) pipe go fore-aft between the 2 stanchions on each side. I cut a "slot" at the top of each vertical pipe on the side facing the center-line of the boat that lets a 1.5 in PVC pipe rest in it. Drilled a hole fore-aft through both the 4 in and the 1.5 in pipes (at the top of the vertical) and pushed a smallish PVC tube through, sort of like a clevis pin. Secured each end with a hitch pin. These support 1.5 in "A frame" like trusses, one across the boat at each stanchion position, with a 45 degree elbow glued to form each peak, about 2 ft above the prone mast in its normal position on crutch and pulpit. A 2X4 ridge goes from the rear peak, over the front truss, and about 2 feet further. I also have a pair of 1.5 in pipes wire tied together that hangs over (and is wired to) the mast about halfway back in the cockpit, each lower end resting on the deck against the molded toe rail on the 23. So the tarps are supported by the mast at the rear, these "legs" over the cockpit, the ridge plank, and the pair of "roof trusses" at each stanchion position. The pulpit and mast support the front of the tarps. I fashioned 2X4 crutch like supports to support the mast in 3 places against the deck, and also against the bottom of each A-frame, so any snow weight doesn't crush it.
A pair of silver Harbor Freight tarps (one large, one medium) that cost me about $60 total on sale cover it. Tied tightly to trailer at every grommet with the cheap braided synthetic line from Home Depot, the kind that has a foam-like core. I like it as it seems to last a number of seasons and is easy to pull tight using something like a truckers hitch or even just wrapped on the trailer frame. Hope it has enough angle to shed most snow, we'll see next spring.