Advice on getting tattoos over some significantly large areas of scarring?

I've got my first tattoo booked for just over 2 weeks from now - just a very small, very simple lettering piece on my inner forearm; not particularly relevant to my question, but just pointing out that I'm a complete tattoo noob!I have some fairly significant scarring on both my thighs (covering about 30cm squared on each leg) and I really, really despise it. I can't bring myself to even wear shorts around people, let alone ever brave a bikini or anything similar.I'd love to get a cover-up done, but have a few concerns:1) How will the scarring affect the healing and aging of a tattoo?2) How visible is the scarring likely to be underneath? (ie. I prefer simpler, non-colour tattoos, will it cover them effectively or just draw more attention to them?)3) Would anyone have any suggestions for inspiration on what to actually get?I'm honestly not the biggest fan of most thigh pieces I've seen (hopefully not offending anyone who may have them, I'm honestly not even sure why I don't love them) and am worried that I wouldn't be able to pull it off.. But the scars bother me enough that I'm still seriously considering it.I would ask for advice from the artist that I'm going to for this first tattoo, but I'm going with a friend who I'm not particularly comfortable with knowing about the scarring and wouldn't be happy talking about it in front of her at all..Any suggestions or personal experiences with cover-ups would be really appreciated!(edits just fixing typos!) http://bit.ly/2Woicsv