I had help with this task. Adjusting any bearings on a bicycle can be fiddly, but with patience you will always get there in the end!
Here is my Instructable on the first step of rebuilding my bike.
Fitting the forks and headset!
Forks: the bit of a bike that holds your front wheel, and steers!
Headset: the parts of the bike that attach your forks to your frame, and allow them to spin freely.