Two months of playing, and my newbie mistakes:
1) I took the perfect fruit mistake to the next level and sold another which grew a month later as well as my first.
2) Had major creativity fail and named my town after myself. My name is Rose, so I am now obliged to fill the Rosetown with roses, which I hate.
3) Confused the Island with Club Tortimer and took ages to go as I was under the impression it required Wi-Fi internet, which I do not have.
4) Merry asked me to catch her a Coelancanth and I caught one on the second attempt. This gave me the wrong impression on how easy it was to catch those fish, and I have not yet caught one for the museum. A couple of weeks ago I spent from 10 to 2 trying to catch another, but as I ended up paying off my current home loan I wasn't too unhappy when I found the truth.
5) One day I heard a strange noise. Reese was selling mole crickets at premium prices, so I looked online and discovered mole crickets were underground. After a week of unsuccessfully digging holes everywhere and wondering why I was so bad, I decided on a whim to visit the museum as I like seeing how my efforts to fill it have gone. Whilst checking out the fish section, I heard that noise. This entire time I thought frogs croaking were mole crickets. No wonder I was having trouble.