Learning Portuguese with help of Brazilian gf

I (M30) want to learn Portuguese to better converse with my girlfriend (F26) who is fully bilingual. Being around her family during the holidays definitely made me want to speak the language. I have studied Italian for years on DuoLingo and have an intermediate proficiency.

  1. Should I quit Italian practice altogether while learning Portuguese so as to not confuse myself? Or is it feasible (perhaps beneficial) to learn them both at the same time?

  2. How should I approach practicing the language with my girlfriend? We talk all the time (in English) - but I’m not sure how I can best optimize our time and make it easy for her to help me learn from such a basic starting point. She’s extremely fluent and of course I will be nowhere near conversational anytime soon. And she’s never taught the language, so I’m not sure she will know what the best way to teach it is.

We leave for carnival in rio in late February and I’d like to hopefully be more proficient by that time! Thanks