I rolled it on and tipped it with a brush to smooth it out.... tipping/dragging is just taking a brush and lightly pulling it over the surface after the paint is rolled on... since the paint is polyurethane, and it was a hot day, I had a bucket of water and put the brush in the bucket it keep it from drying... when i took the brush out, I'd just shake the water out and it worked fine... the finish is not perfect because it is over plywood, but it looks very good.
I'd roll on a 2x2 foot area, then tip it and move on.