As a paid research assistant and full time honours student, I would work in the lab (as a research assistant) after class and on weekends. Although it was hectic, the graduate students I worked under were very knowledgeable and I learned a great deal.
I really enjoyed collaborating with other students on projects, but also enjoyed the responsibility and independence. Once tasks were delegated, I was free to do my own work and ask questions when necessary. The other undergraduate students (co-workers) were wonderful passionate people with a drive to succeed. I really never had any issues with anyone that I worked with in the lab.
I would say the most difficult part of the job was sometimes too much independence. Without any training I would be tossed into a situation and be expected to figure it out (which can be stressful). However, from such experiences, I learned how resourceful I can be and became a more competent and capable individual because of it.
Overall, I would say the most enjoyable part of the job ended up being the required growth and responsibility that was given to me. I learned a lot about adapting, problem solving and thinking critically which I consider very valuable lessons. Other than that, it was the people; when you work in an environment in which people respect you and trust you to get things done, you are motivated to do the best you can.