Well, Gimpel; I guess a few questions are in order first. Were any of the original mounting holes damaged in the dramatic destruction of your awning?
If so, that's your first "Gotcha". You may have to seal the old holes up and move the mounting position a few inches forward or aft, wherever you have the clearance.
Did any of those Youtube videos cover the importance of sealant during installation? If not.....SEALANT!! in the holes, under the mounting surfaces, etc. Those are excellenct places for water intrusion that you won't see until damage (rot) is done.
You would also be WELL ADVISED to have at least one other person when installing an awning. They are really clumsy for one body to handle.
There's absolutely no reason for you to blow $400 bucks on shipping. If you can get the same model and size of awning locally, then that's a no-brainer. If there's no damaged original mounting holes, and you have no issues with the brand/model of your old awning, then you would know that a new, identical one would go right up there. With a different brand/model/size, then you're starting from scratch......just sayin'.
Other than that, you and a helper should be able to do it just fine. (Do pay attention when hooking up the wiring.....you don't want it to try to run backwards.)
Right now, my manual awning is setting on sawhorses because a couple internal components wore out in the ratchet/locking mechanism, so it's entirely do-able.
Roger