Thanks all, really appreciated; small forearms only here
It's line work with lines 3mm wide and an area approx 8cm2 so on the small side. It seems to be healing well and I have used a fingerboard this week, the first time being on day 4, and it was fine.
I think the only mis-step I may have made was last Saturday when I went for a walk and still had the tattoo wrapped, it was a humid day and I was sweating, not loads but enough so I could feel / see it under the wrapping. This was for about an hour before I was able to remove the wrapping. So far I have no idea whether this will have had any impact, I doubt it.
As Liam says I think the main danger is physical damage i.e. scraping during the early stages of healing. I found this on Youtube after posting on here, he seems at the serious end of weightlifting (and interesting and reflective too) and is heavily tattooed and has no qualms (or ill effects it seems) lifting the same day as getting tattooed (see 1m 55s into the video):