Re: Trouble with first and second gear....
It kind of sounds like the first / second synchromesh unit may be what is giving you problems. If the teeth themselves are worn they may have trouble engaging and switching gear which may result in hard shifting, and those pesky grinding noises.
Although this doesn't eliminate thrust bearings, blocker rings or inserts, or synchronizer keys or springs.
Also when was the last time your transmission fluid was changed?
have you ever had the transmission serviced, or thoroughly checked over by a shop?
Has the transmission ever been overhauled/ rebuilt?
Do you have a tendency to shift hard/ and or powershift?
Thats all I have right now, sorry I couldn't pinpoint the exact problem for you. Someone else may know more/ may even correct me.