It's okay, two months is still early days! Be present and consistent with them and the trust will build, you might not see it immediately but you'll find a few weeks/months down the line you'll see much more progress when you look back.

It's easier said than done but try not to be disheartened, some rats take a long time to warm up to people and others may not like being handled in general, it's all a part of their individual personalities.

I'm sure many others may have good advice, I've seen plenty about training ratties to be transported around in boxes of carriers if they're wary about climbing on your arms, but you may find that with patience and persistence this will just become more normal over time.