I have an ground floor 18 ft extension which runs along the front of my house. I would like to convert this to a pitched roof for cosmetic reasons. The extension protrudes about 3 foot and I would like the pitch to run at say 45 Degrees. Bearing in mind I am only barely adequate at DIY; is this job beyond the ungifted amateur? To my simple mind I buy some special brackets from a builders merchant , attach these to the wall at regular intervals, screw 3x2 beams from bracket to edge of roof, attach lats then tile. I suppose things are never that easy . Are they????