When it comes to rolling out the walls never ever use a cheap foam roller. Foam rollers never evenly absorb the paint out of the pan and will actually add time to you project and cause more mess. Buy yourself a synthetic professional 3/8 nap roller head for about $6 to $8. Not only will the paint be applied in a smoother fashion you will experience less work and mess.
When spraying your house, it is a good rule of thumb to spray in the direction of the grain of the material. So if you have siding that runs horizontal, you want to spray in a horizontal style. Also, when you go to spray, the gun should be approximately 12" from the material that you are spraying. Do not pull the handle to spray with your hand still. This will spray a lot of paint in one spot causing it to drip. So have your hand moving when you go to depress the handle. This will give you an even look to your paint.
You scuff up existing paint for two reasons. First, you want to get rid of any oil, grease or dirt trapped in the top layer of paint. This is the stuff that cleaners and degreasers can't get off. The second reason to scuff is to set up a physical bond for the new primer and paint to adhere to. You want to give the old paint some tooth so the new sticks better.
THE COMPOSITION. Now go back to the subject and your first impressions about the painting. It's time to analyze how the artist made you feel the way you felt using the artistic means it his/her disposal. The composition is the position and the balance of the objects and figures in the space, the interrelation of their size, coloring, shading etc. How exactly does all that impact your perception? Let's dig in.
When all of the spraying is complete, its time to remove all masking tape and paper and start touching up your entire home. This step is pretty time consuming because this is the final stage that really makes your home look good. The more time you spend here, the better your home will look.
If you are going to paint your home and have decided to do it yourself take a little extra time and spend a bit more money to do it right. Colors are subjective, but the quality of materials and painting tools are not. For this example we are going to go through the process of painting the interior of a typical home. In just about every paint job I did I insisted that customers used an oil based paint on woodwork and doors. Not only does oil paint make wood look and feel better it gives you a superior durable and washable finish that water based latex paint can't. There is nothing worse than seeing a newly painted door or frame ruined by fingerprints and other marks.
CONCLUSION. Once again go through the images and the story of the painting. Was your first impression different from what you see now? Take a 5-minute online test to explore your preferences in fine arts. In 5 minutes you will confidently say "I prefer impressionist cityscapes", or "This room calls for a color field painting", "I need to have an art nouveau nude in my bedroom" - and you will know what you are talking about!