You don't need to hold the brake unless you just want to.
Take out the spark plugs and use the kicker to make sure the engine is free. In neutral, but do not pull in the clutch. If it won't kick through, fill the spark plug holes with automatic transmission fluid, wait a couple days to give it time to seep past the rings, and try kicking it again.
..........Be very cautious with that fuel tank. Decent condition stock paint is very hard to find these days. If you plan to run a different color scheme, get different tins and set your stock ones aside for safe keeping.