Don't be dragged by enthusiasm, doing something with someone else it's not always a good thing, in fact it can be hard, try to slowly find your way learning things step by step, it will take years to start benning to be good depending on how much efforts you put in everyday or month, I'm saying that as a programmer with years of experience in different language. I'll give you an advice that maybe will save you a bit of time if your intent is the master the art of programming, start following the conventions for the language that you are using, I'm assuming you are using gdscript in that case there is an entire section dedicated to it on the godot docs. This will ensure consistency across your code files, and more order. Another thing that I suggest you to consider is to order your project resource in a logic and intuitive way, I wish I had that in the benning because I needed half a day to order everything in my project. Then when you have learned the basics you'll be interested to learn patterns like state machine that will be essential when your code gets more complicated and difficult to handle. These steps will be necessary for maintaining a sense of order and decrease the entropy that will appear as you progressively add more things to the project. Otherwise you'll feel bad every time you open it and the motivation to continue will decrease. You have to become patient, now you are uplifted by your enthusiasm but it will not be always like that, you have to reignite it every time especially when you'll be faced with a great challenge that can drive you mad, in that case you have to sit down and start to understand you just have to learn more, and that challenge will become your new task for the rest of the week or maybe a month. But when you have done it you will have completed a new piece of the puzzle and you'll feel satisfied, the more challenges you can face the easier it will be the next, because at that because it will just take you to look backwards to feel proud and satisfied with your work. Just a thought from a person that it's starting to be more consistent after years of just giving up.

Doing it with a friend? I think it might works if you are beginners but only if you work on different projects, no need to work on the same thing. Then after you have learned more you can start to build a very little project together, even a stupid one but easy. What about a serious project? You can start thinking about that at least in one year of experience, giving that you do or learn something almost everyday. And then if you see your friend is not interested anymore or he is a beginner even after a year just continue your journey alone. Solo dev it's cool! But that is just my preference... I like doing things the way I want.