They changed the rules and started applying the NR quota last year (or year before?), so your odds will suck if you are a non-resident. Going in the guided pool might help your chances of drawing, I haven't looked closely. You will get all of your $ back except the $13 application fee. You will have to also buy a "game hunting" license, but you can get a refund for that if you check the correct box in the application process, some guys miss it.
It is possible to do it DIY, but having a guide for the archery hunts will greatly increase your chance of shooting something, the archery success rate is typically < 10%. Rifle and mzl harvest rates are much higher, but have lottery type draw odds. I have only hunted it once, archery in 2014, it kicked my butt. It was my first time on the rock and I had a bad chest cold which made it tougher. Saw lots of ibex but never even got within rifle range. It is virtually all public land. There are some good videos if you search the www.
Good luck if you give it a try.
JR