How to hang a heavy mirror on a tiled / plasterboard wall?

I recently fitted a heavy mirror to a tiled plasterboard stud wall. You need to fix 2 part - interlocking metal brackets, one part on the back of the mirror, the other part to the wall. Dependant on the weight of your mirror, I suggest you fit 3 or 4 brackets in line at the top spaced say 100mm apart ( 2 top left, 2 top right). Correct alignment of the brackets is critical they need to be set perfectly square on both the mirror and the wall. Apply masking tape to the wall and mark the positions of the brackets fixed on your mirror to the wall. You need to mark the exact location points of the brackets and a horizontal line representing the point where the brackets inter-lock. This will show you where the mirror will be positioned on the wall BEFORE you drill any holes. Once you are confident you have the right height setting and alignment positions your ready to the drill holes for the wall mounted brackets. TIP: cut a piece of wood to the width of your mirror and mark the bracket position exactly and carefully onto the wood. Use the wood to transfer the positions onto your wall. Use a spirit level to check the wood is square and your bracket positions will be square also. Drill the wall and secure the metal brackets with TOGGLE fixings -used specifically for plasterboard, available from B&Q etc. Hope this helps.