Courses are not the best way to learn how to install hard wired IMHO. You cant teach lifting the right floorboard or drilling angles, or hiding cables, ect ect in a classroom. If I wanted to learn this industry I would approach all the local co's and see if they want an apprentice. You are willing to pay for training courses so I guess you wouldnt mind getting paid to learn even if it was a low wage. If you already have experience of wireless and CCTV you already have something to offer a potential employer. Depending how fast you pick it up you could be a good engineer in six months