I have a continuous line 3D style 5”x4” (hard to describe without pictures), rather complex to do, only has black and red in it, sat for around an hour and a half. Cost I believe £110/£120, which IMO rather cheap.
Your best bet is to get some reference photos together, find an artist you like the look of (please find healed tattoos, it’s vital to know if your artist has a history of feathering/blow outs, as mentioned above, do not go for the cheap artist, if it’s in a visible spot I also wouldn’t go with someone fresh from a traineeship) and have a chat with them. If you’re near London I have heard good things about Gypsy Stables and a friend has all his work done there and it looks great. If you’re more Northern, Red Tattoo in Leeds is good, can personally vouch for the staff being a friendly lot, very unintimidating and reassuring.