Break a big project down into small steps, then set realistic goals as to when to accomplish each step. Revise these as needed. Organize your tools and materials. Ask for help, and offer yours. Try anything once, well almost anything.
Failure is how almost all learning takes place.
Try using colored pencils for dry brushing. Use a lighter shade of the object. Think easy maintenance. Keep the backdrop simple. Use it to add depth, but not to distract from the scenery.