Always keep the wand moving. And aim it away from people and pets.
Paint sprayers can handle many different sizes of nozzle tip.
Do a small section with the sprayer, then back-brush with a paintbrush or roller for an even finish. After around 20 minutes, check the areas that you have finished for puddles. If you see any, brush or roll those areas. Washers designed for homeowners produce less pressure and reduce the chance of damage. Many pressure washers allow you to apply cleaner through the wand.