if you were to meet someone new for the first time, and saw a forearm tattoo, what preconceptions if any would form
I don't see many people with tattoos. I've met enough people with tattoos to know they aren't much more than another form of decoration (ie, not much different than clothing style, etc, simply more permanent).
However, it's still different than what I'm used to, so there is a bit of 'reading a book by its cover' when I see someone I don't know sporting a tattoo. It's not bad, or good, but noticeably different.
If every other person you meet has a tattoo, then you'll find there's no real cultural pressure either direction.
If you can count the number of people you see with a tattoo daily on one hand, you're going to see a lot of negative reactions.
Humans have a very strong categorization system as a survival trait, and unless people in your city are culturally raised, as children, to accept tattoos as simply body art, then you're going to be on the wrong end of that instant categorization.
Keep in mind that it's generally the 'bad guys' in 'family friendly films' that wear tattoos. There's still a cultural stumbling block for that.
also would you recommend going forward.
My religion teaches us not to get tattoos (body as a temple, etc) so my only objection wouldn't apply to your situation.
In which case, the only advice I can give you comes from Red vs Blue's Tattoo PSA, only because it's logically consistant.
Paraphrased:
Think of yourself 10 years ago. You were an idiot then! Would you trust yourself, ten years ago, to pick out a permanent mark for your body? Of course not! Guess what? 10 years from now you will only just be starting to realize how much of an idiot you are right now.
You may feel very strongly about your convictions and beliefs now, but the only constant in life is change.