Latex paint refers to water-based paint, the most popular and environmentally friendly paint. Since latex paints provide great color retention, they’re ideal for exterior walls that face a lot of weathering. Latex paints are also a good option for interior walls that are subjected to a lot of moisture, such as bathrooms and laundry rooms. Additionally, latex paints dry faster than oil-based alternatives and produce fewer odors.
It's up to you. Outside is much harder because it requires more prep, patience, time, help, money and of course, effort. I have been painting my own houses and rental properties interiors for 20 years, and I painted the exterior of one, once. I then had it promptly done again by professionals who said it would have been cheaper if they didn't have to undo my work first. My advice is to get pros for the outside because everyone will see it.
Homeowners report that painting a home’s exterior costs an average of $2,923 with a typical range between $1,734 and $4,119. The average price per square foot ranges from $0.50 to $3.50 depending on your location, condition of your exterior and accessibility. Stucco and brick cost an average of $1 per square foot more than vinyl or wood. The average 2,500 square feet home costs an average of $4,000, though it can range from $1,250 to $8,750.