What’s some advice for living with a partner for the first time?

It’s good to pause the bickering for a minute to enjoy some good things about living together then once things cool down it’s very helpful to have an open conversation about what your expectations are and what his expectations are then find some middle ground where you both make concrete agreements on who is responsible for what and when. You guys can always re-work these agreements later, but it’s good to create a clear understanding that you both mutually came up with and find fair.

Just so you know though you’re not going to be able to bully or nag him into being more personally responsible. That’s something he hast to want for himself. These are life skills he probably hasn’t learned yet. If you can, without copping an attitude about it, try not to enable him also. Expecting him to be a mind reader, you getting frustrated and doing abcd task anyway because you’re sick of waiting around for him to do it or he did it, but not up to your standards doesn’t help either of you become a team.