Underlayment and Steel Roofing-- Metal Roofing 101 with Todd Miller
http://neh.co.nz/index.php?option=com_k2&view=itemlist&task=user&id=409728
Make sure the panel is square to the eave of the roofing system so that every one of panels mounted afterwards are straight. Next, put a screw into the securing strip to keep it constant prior to mounting the screws