Paint along one whole Bob Ross episode. Keep whatever happens.

One episode of The Joy of Painting, start to finish, brush in hand. Discount-aisle acrylics and a canvas board are fine — that's roughly the budget Bob worked with. Pause him as often as you need; he won't mind, he never does. Here's the thing: your mountain will not look like his mountain. Somewhere around the second tree, your canvas stops being a copy and starts doing its own thing — and that's the part worth keeping. When the credits roll, stand it next to the screen and see what you ended up with.