AnswerYes, you can actually fix the door yourself. I would suggest talking to someone at your local hardware store before doing so, though, in order to figure out how to do it. And there are shops out there who offer online payment and delivery of patio doors- you just need to ask your salesperson to see if your store offers this.

AnswerTo install patio door handles you must first decide where you are going to put the holes in the door to install them then install the handles by screwing them into the holes

Answeryes you can definatly put on new handles by yourself, here's what you do. More often then not these handles are held in place by about 4 screwes, locate were they are and unscrew them to take off the old ones, if you dont have new ones try to get the same basic style so you can match the screw holes otherwise you will have to drill new ones to match your new handles.