Driver's Door Issue

[CysMyGuy]

So I waited until winter to have my basement finished here in CO and the X has to sit outside for a couple months. On a very cold December morning, I went to get in and when pulling on the handle, something inside the door broke - leaving me unable to open the door without rolling down the window to use the inside lever.

Any idea if this fix is a possible DIY, or do I just take it to the local mechanic. Keep in mind - the garage is full, so I'd need to do this in the driveway. DOH!