I agree "I have got a roll-up-my-sleeves attitude" sounds unnatural. If you really want to use that phrase, you can say something like: "I am ready to roll up my sleeves and get to work".

It's very old school , you may hear right wing politicians say things like this . But refers to a since of do it yourself hard or dirty work to complete a job and have no second guessing or quitting to do the job because of the risk of the type of work

Hmmm....really it just means that you are prepared for some hard work, but to say 'i have a roll up my sleeves attitude' is not something you would really hear people say....a phrase with a similar meaning (at least in UK and Ireland) would be 'i enjoy getting stuck in'. Meaning you enjoy getting started on hard work, you aren't lazy.