I have recently successfully replaced the digitizer on my ATRIX, I can't say it was a fun endeavor, none the less it is fixed. Like you, I watched some videos on YouTube and ordered my parts from Repair Universe who was one of the YouTube video contributors.
The take apart was a little scary especially when you get to the flex cables under the battery, the whole thing didn't seem right while I was taking it apart. I just kept following the instructions.
I was not a fan of the 3M double-sided adhesive strips, I custom cut everything but just seems like I occasionally have to keep pressing it around the edges.
There are some custom ATRIX strips available on ebay from some place in China that may be worth a try. Have a can of air handy to try and keep it dust free during re-assembly.
Because I have taken apart once and worked it is easy enough to re-take apart. I'm going to try the custom adhesive from ebay but thinking that a regular adhesive for this and a proper curing process may have best results.
Hope this helps.