Exterior paint prep can be a daunting task to tackle. Depending on the size of the project and your experience level, you might not even know where to begin. Like everything, the best way to start is with a good plan. Identify what parts of the project can be broken into sections and what parts need to be done together. Look for areas that will cause you trouble, so that you can approach them with your eyes open. The planning stage is also the best time to consider testing for lead paint. If you have a house that was built prior to 1979, it's always a good idea to know what you're getting into. This is especially important because it's likely that you'll need to sand or scrape your existing exterior paint during the course of your project. See this Family Handyman article Testing for Lead Paint for more details on how to easily and affordably find out if you have lead paint.

There are permanent features of the home that have their own colors which cannot be changed when painting the exterior of the home but can have a dramatic satisfaction level that is experienced when the painting is completed.  Roofing shingles, paving blocks, concrete surfaces, stones and other such features are prime examples of the colors that should be considered when selecting your exterior color scheme for the home.  Homeowners can work off of these colors to make a home that looks uniform and luxurious when the exterior painting is complete. Thornton House Painters
For a more skilled do-it-yourselfer, either flat or satin paint is suitable. If you are hiring a professional painter, choose the paint finish based only on results, not ease of application. Professional painters are proficient at applying all types of paints and paint finishes. If they make an error, they are accountable and can be expected to fix the issue. 
You can expect to pay between $700 to $3,000 to paint wood siding. You’ll end up spending $1 to $3 per square foot, but typically you’ll find this material is cheaper than brick or vinyl. Wood requires some type of sealant, be it paint, stain or oil. Lumber takes well to a wide variety of coverings giving you endless options for modern, contemporary or classic looks. Some things to consider when choosing wood:
To get basic measurements, measure the length and width of each wall you want to paint in inches. Multiply the length and height together, and divide by 144. This will give you the square footage for each wall. A gallon of paint typically covers around 400 square feet. In some cases, you may need a primer 1 first, then a single coat of paint, meaning that you may need one gallon of primer and one gallon of paint to cover 400 square feet. However, if the wall requires multiple coats, this will increase the total amount of square footage required, and therefore the amount of paint.
To calculate the cost of an interior paint job that you do yourself, measure the square footage of the interior space you need to paint. Consider whether you will need primer or multiple coats to help with your color transition. If you’re just adding another layer of the same color of paint you used a few years back, you may be able to use a single coat and skip the primer. Thornton House Painting
Satin paints require a bit more care during application in order to avoid lap marks. As with interior painting, it is important to keep a wet edge during application. It is important that satin paints be thoroughly mixed before application to keep the resins and pigments in uniform ratio throughout the can. Satin paints should be mixed just before every painting session. Thornton House Painters
You will have a choice of four basic paint sheen groupings: flat or matte, satin/eggshell, semi-gloss, and gloss. Your home's exterior is subjected to major stresses that include rain, snow, UV rays, and physical wear. All of that is compounded by the sheer difficulty, cost, and extended timeline for painting a home's exterior, making the question of the perfect exterior paint finish a critical one. Thornton House Painters
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