Fitting external aluminium patio doors

[Christine1850]

Hi, We've bought some Schuco sliding patio doors. We would have had them fitted by a professional but couldn't find anyone (we are fairly rural). They come with some instructions but my husband needs some advice about drilling the frame that isn't covered in the instructions. Obviously he doesn't want to get this wrong. Has anyone else fitted them, or the bifold as I expect they are similar?