Probably the most important skill to have as a User Researcher is observation. The ability to spot user behaviour when they are performing tasks is essential.
Being able to take quick notes and tidy them up later will definitely help any budding User Researcher.
Being organised is crucial to success because you will be dealing with a lot of different types of data and need to refer back to it later. So get your house in order.
Being able to sum up what you did, how you did it and what you found on a few slides out is basically all you need to make good presentations.
Depending on the maturity of the UX Practice within the company there will be a lot of times when User Research is overlooked. Try to be patient and introduce small changes.
For the same reason as patience, you will need passion to help drive those small changes through. Be bold, but be careful.
Being a User Researcher is a full time learning job. You will never know it all and will constantly be learning. Things will go wrong, just like they do in usability tests, but that doesn't mean you should give up.