For me, it was what I consider vague directions and parts fit when it came to the compactor. I'm sure other can breeze right through it. I think my model mojo is waning and I am not sure how much longer I will keep building. One problem that was of my own doing was the fact I painted the compactor parts all on the trees. I think I would have been far better off if I assembled the main parts and painted it as a unit. I had to spend a lot of time cleaning the pins and the holes the pins fit into. I could have done that better. A third hand could have helped a lot also. I will be very interested in comments from others that tackle this kit. It very well could have been mostly my fault. I find as I get older my patience is not what it once was.