My last trip I took I caught well over 10 collareds by hand, but this is normally done in an area where there are "liftable" boulders or flat rocks.
A noose would be very beneficial for the area you were in more than likely. To noose, all you need is a fishing pole 3-6' long and some waxed dental floss. Start with a 10" piece of line...tie one end around a pencil in a tight not, the the other end gets tied to the end of your fishing pole (or long stick etc)
Slide the pencil from the knot, and you should have a short length of line hanging from your rod (shut-up Eve)...
Next, you just form a slip knot from the loop end, by pushing some of the hanging line back through the loop...open it up, give it a pinch to hold the loop open and viola...
The waxed line works rather well since it has a slight tackiness that will allow the line to stick to itself. Approach your lizard slowly and just put the line of the neck and lift up. The weight of the lizard will be enough to close the loop. I lift them up then immediately grab them as to not cause them any injury. I have never cut or mamed any lizard in this fashion. It's a great way to get bit, since you do have to remove the loop. Don't worry, once their wieght is off the line, the line will not be tight enough to choke them. The tightness of the line and the closing of the slip knot onyl occur when the line is tight. This works great on lizards with large heads and small necks like collareds, and likely chuckwallas. The lizard first has to be approachable. I failed on several attempts to noose some African Red Headed Agama...they will simply not allow you to get within 20 feet, then they are extremely noose shy if you do. I learned another method for fishing for those, but there is a good risk of injury with the other method. Not my preference, but I did manage to catch three without injuring them.
Give it a try and post some pictures. If you need any more clarification, let me know!
John E.