Seeking Spray Tan + Eyebrow Tint Timing Tips!

Hello! I'm heading to Europe for a wedding and plan to get a spray tan and brown tint before I leave. I've read that if I'm not careful, that combo can discolor the tan and/or brow tint. What order would you recommend I get these done, and how much time should I leave in between the two treatments? Any tips would be hugely appreciated. Thank you!