I used a tapejara to tame a quetzal solo. I added enough stone into my inventory to slow my ride, then hopped in the front seat with a tranq rifle and whistled my tapejara to attack the quetzal. Since it was slowed down, it wasn't able to get close enough to the quetzal to attack it after I started firing. When the quetzal was getting too far away, I dropped some rocks to speed up. It was overall a somewhat tedious process, but in the end it was worth it.
If you drop a quetzal due to knockout, and it lands next to a giga...just know, the quetzal belong to the giga. Now you get to watch your would be quetzal get eaten by a giga. Now you can go home and cry.
To solo tame, grapple to an argentavis, and be ready to set your argentavis to passive and attack my target on command. Just maintain a process of having your argentavis chase the quetzal, when you get close enough set it passive, then fire a tranq dart/arrow. This is a long process, but it is by far the easiest way to solo tame, unless you already have a quetzal.
This tip is only if you already have a quetzal available. The easiest way to tame a quetz, is to build a quetz catcher. You can make it out of thatch and its hands down the best tactic. A lot of YouTube videos available on how to build one. Knock it out in the catcher, and you don't have to worry about it getting hit.