I'm interested in going to Skellige early just to collect the Mysterious Elf card. The answer to a related question makes it seem like it is workable to travel to Skellige as a lower level player (I'm currently lvl 12). My concern isn't directly addressed either in the question or the answer. Will I be grossly under-leveled for any quests needed to unlock the ability to play gwent with players I need to play to get the Mysterious Elf card? I read one Reddit post that suggested I need to complete at least one level 24 quest.
I'm not the greatest fighter, since I mostly just hack and slash my way through monsters. This means there's no way I'd be able to defeat a level 24 quest of any substance at this time.
Initially I had a couple of other concerns about being able to return to Velen/Novigrad after making the trip to Skellige. That doesn't seem to be a problem1. I was also worried I'd bump into a point where I'd fail/miss other quests but it seems like I can get the Mysterious Elf before that point, since that happens around Madman Lugos and I play him after I get the Mysterious Elf.