I have tried the do it yourself method on tip replacement- it is OK for me on some of my cheaper wood break shafts with triangle tips- not perfect- for playing cues I definitely prefer Muellers- yes you have to mail the shafts, yes you have to wait a few weeks, I send multiple shafts always, they are the least expensive in tip replacement bc their service includes a complete shaft cleaning/reconditioning and they come out like new!
The guy who does the work is Troy Downey- as good as anyone in the U.S. --- how can you beat that! I trust even my most expensive $thousands cues with him, but I do not trust USPS- I use Fed EX only. I want my playing cues to be perfect in terms of wood shafts/tips.
I recently bought a Predator BK Rush for tournament 8 and 10 ball breaks - where you need both power and accuracy - I see that their warranty makes a big deal out of how that BK rush tip is replaced- so if I will cross that bridge if I ever get to that point with the Predator CF break shaft.
I sympathize with guys who have to drag all their equipment to tournaments, etc. to do repairs- it is a long day(s) for them and they have all the costs of travel, etc. and a limited audience, so the fees have to show high profits on tips, etc.
One thing that I learned for sure- only have truly the best guys out there do ANY work on your cues, Over 40 years I have come to trust very established cue makers as also being the very best cue repair people - some of these cue repair ONLY guys are second rate and their work reflects it- not horrible- but definitely second rate- I will not mention those names, but I could! I think they try to do their best.
My experience with Muellers and Proficient has been excellent. Ted Harris, when he was in Fl. did great work on some of my shafts, Mike Webb was excellent when I was up in Northeast. My point is, if you do not trust yourself on shafts, tips, etc- find the very best that you can to do the work- the names that I just mentioned are some of the best out there from my own experience.