Have had my tongue done for like 5 years now, so my memory is abit vague on the process.
Basically, They spray some stuff on you tongue to numb it ( dont swallow it ). The needle going through doesnt hurt at all. Them yanking you tongue out with f**king pliers hurts more lol.
Aftercare..say goodbye to eating for a week. It HURTS WAYYY to much to eat lol. Youll live on soup(cold) LOL and Ice cream.
As for reputable piercers. Ask around you friends if theve have stuff done. Word of mouth is always good enough. Price , I Paid £25 for the piercing and a week later i went back to get a smaller bar.
The 1st night i got it..lying in bed, i regretted it so much. I was like. oh my god what the f**k have i done 5 Years down the line, i still have it
Hope ive helped.