2000 Ford F-150 Hard to find first gear

I have only had the truck a short time. The first week driving it or so it shifted into gears great. Now as time progresses it is getting harder and harder to find first gear. It will go into all the other gears easily but while at a complete stop it is difficult to shift into first gear. Now this is my first manual so I am unfamiliar with what all is involved. My guess is the synchronizer or just the clutch going out. It does not make a grinding noise just very hard to shift into first. I have found that by shifting into another gear then going into first helps the matter. All the fluis levels are full. Any thoughts? Thanks.