For underlined 55, choose the best revision, if any. If You Do It Yourself If you are handy with tools and have the experience, you can save money by doing many jobs yourself. Unless you are skilled 55 in wiring, let a professional do it. If you are not skilled in 55 plumbing or installing heat systems, allow someone else to do 55 it. If you don't know how to cut through walls, you should rely on 55 a professional to do the work. When you buy the required 55 materials, it pays not to skimp. Good materials are not necessarily the most expensive. What you need are products that look good, are easy to maintain, and last a long time. Buy only from reliable dealers. A: Unless you are skilled in wiring, plumbing, installing heating systems, and cutting through walls, you should rely on a professional to do the work. D:Unless you are good at home improvements, let a B:(No change correct as is) C:Unless you are skilled in wiring or plumbing and heating, let a professional do it. Rely on a professional to cut through walls.