The research is complete and you've scoped out the project. But don't grab those tools or the phone book just yet. Discuss the project with people familiar with your DIY skill level and ask for their opinions. Don't make things hard on yourself by trying to improvise with improper tools. Professionals use the correct tool for the job to achieve professional results.
Safety is always the first concern in any project.
Familiarize yourself with all aspects the project and the safety precautions. Older homes may contain hazardous materials. If your home has lead-based paint or asbestos, hire professionals to deal with these hazardous materials. Familiarize yourself with all the necessary power tools and read the owner's manual before operating. If the project requires a ladder, use it in accordance with the manufacturer's instructions.