No, its not the skill to adjust it. Its the skill to shorten the TRE's and adjusting sleeve.
I did this once to a D44 TR. I cut off 1" of threads on each end and 1/2" on each end of the adjusting sleeve. I did not want to shorten the adjusting sleeve too much, hence the 1/2" rather than 1".
The patience and skill come into play here where you need to file the cut edges on the threads. These threads are fine threaded and need to be cleaned up and have no obtrusions in the way so you don't have problems with tightening the adjusting sleeve. Needs to be clean so the sleeve will turn freely by hand. I cleaned my cuts on the threads with a special "V" groove file, very fine and small tool. Took some time to go thru the cuts, but the patience paid off since the TR was like any other and worked just as good, too.