That horse has gorgeous natural gaits and has the nicest balance in motion of any horse I've ever seen on any of these bulletin boards.
That horse can do anything.
The thing will be, you'll have to forget everything you learned for Western, that jog and lope, English Pleasure, and all that. Just forget all that 'head down and round' stuff too. Forget that lopey huntery loose rein stuff too, if you want to live in eventing. Sure, people get away with it a little at the lower levels, but everyone else is having heart failure watching them.
Besides that, if you apply yourself, you won't just be doing the lower level stuff with this horse.
You should absolutely zero problem, if you get some good instruction and are willing to do things differently. You're just as balanced as your horse. Cripes
that is a nice horse!! Elegant and catty and beautiful natural gaits!