Don't upgrade your tools
^_^ Weird, isn't it?
I'll take one example: watering can.
I hope it helps. I think you'll be saving a lot of money & time if you use this, rather than using the conventional upgrade ^_^
Harvest Moon A Wonderful Life, Another Wonderful Life, Friends of Mineral Town, Back To Nature, Save The Homeland, More Friends of Mineral Town
Don't upgrade your tools
Befriend Van, give him an egg everytime he comes. You can do this when he has finished his job, closed the store and went home. Follow him, talk to him and give him eggs. He'll like you more, and then you can haggle the price until 400 G.
To make your goat happy, use the brush for you cow. She can use it too!
Never mind the face that the goat shows. I think she'll never smile. :p