You can have any two of price, quality, or service.

The most important part of the kilt is the thread that holds it together. Only a few kiltmakers - usually the hand sewn kiltmakers - use the really good thread from Great Britain or Germany to sew up kilts.

I don't think there's any problem with someone who can thread a needle making a quick repair before the problem gets a lot worse. Kilt maintenance is something that sort of evolves with kilt ownership. If you feel better taking it to town to a seamstress or a tailor you can do that too. But, don't see any problem tacking things in place yourself.