My wife had a similar attitude. Not toward selling the tractor, but against me getting a snow blower for it. She didn't want to add to our debt when we're trying to pay things off, which I understand. However, she's never the one to help move snow. (She has multiple ruptured discs in her back and neck, has had 1 surgery that didn't last long, and used the throw her back out at the drop of a hat so I never ask or expect her to help.) The issue I have is we have 4 kids and all of them were inside playing games/watching videos for the *hours* I was out digging through 40+ inches the week before Christmas, and we only have a 100ft driveway. Then I went across the road to help the single mom after they borrowed one of our shovels. Then she asked me to help her friend a mile down the road. Plus I did a 150-ish ft driveway for a mutual friend, 20ft section for another friend, and moved the pickup truck plow piles for her mom/step dad so they could use both garage doors (driver made enough from for 1 vehicle). So I spent 8 hours plowing and using a bucket one day, and at least an hour a day for the next 4 days. All while she was in the warm comfort of the house. She finally agreed that the 0% for 48 months and $76/mo bill wouldn't break us, and would make my life a lot easier. Plus the blower was simple enough for her and one of our daughters to figure out that they could now help. It took a few days though.
As for tracking finances, if you don't already use it checkout
www.mint.com. I've been using it for years. It can link up to bank accounts, credit cards, loans, etc. It graphs out expenses by category, vendor, date, etc. It can create and track budgets, set savings goals, and a few other tricks. All for free, and owned my Intuit (TurboTax) so reasonably trusted. Read-only access to all your accounts so even if someone hacked it or you shared access, they wouldn't be able to transfer or withdraw money, or max out credit cards.