Door Hinge

We currently have an old 6' sliding glass door opening onto our patio. I want to replace it with new dual pane slider and I am thinking of increasing the width to 8'. My questions are these. The current slider is on the back wall of the house and is the load bearing wall for the trusses. How difficult of a task will this be? More importantly are there precautions I need to take to ensure that nothing "sags" when I modify the existing opening and install a new header? I'm a pretty good diy'er and have done a number of remodeling projects around this house and others. I just don't want to blow it on this one. Thanks in advance for the help

I have a steel entry door with 2 sidelights installed in 1991. I know the jambs are 1 piece molded wood. The wind caught my storm door and ripped out the upper and lower piston brackets from the jamb, taking out a nice chunk of jamb wood with it. I was thinking a putting a 1/8" aluminum plate over the damaged wood and securing it with galvanized stove bolts & nuts through the jamb from the outside then securing the storm door brackets through this plate, again having to use thinner bolts & nuts instead of screws. Has anyone tried this type of repair or is there an alternative without having to remove and replace the jamb? Thanks for any and all help. Tony