Skier, I am east of Dallas.
I really appreciate all the help, but before I go through all of the trouble of finding MSMA and then using it to treat my yard, I need to make sure that it is worthwhile. Someone on the golf forum suggested that there are maybe some spots in my yard that just need to be killed with Round Up and re sod. One guy said that he battled with dallisgrass infestation for years.
I don't mind doing the work if I have a reasonable chance of getting this under control, but if it's a lost cause or I'm in for a 3+ year battle, I would strongly consider laying sod. I'm thinking that at least my side yard would need to be re-sod.
Here are some pictures of the yard.

This is what I would call my Level 1 situation. Probably half of my front yard has dallisgrass like this. Lots of dallisgrass but probably 3/4 bermuda.

This is my Level 2 situation. I'd say the majority of my back yard is in this kind of shape. Bermuda is starting to be 50% or less of the groundcover. Also some spots like this in my front yard.

Level 3. Pretty much all of my side yard, chunks of my back yard, one small area of my front yard. Basically ZERO bermuda and the dallis grass is right around 100% of the ground cover.