The Time is Now!
It's time to dig in, think hard, try and try and try again, and keep making forward progress. You've got this.
You should not expect this to be easy. You should not expect to complete this project in one sitting. You should expect many frustrations and many moments of "What am I even thinking?!?!". But have faith: if you push through, if you persevere, if you make it to the finish line - you'll have something to be proud of. You'll have accomplished something you never could have dreamed about a couple of months back. You'll have written yourself a custom, complex budgeting application in Java. You'll have verifiable proof right up there on your GitHub that you know Java.
You got this!
As always, the entire CodingNomads team and community is here cheering you on and available to help. When in doubt, reach out.