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How Do I Reduce Hiss On Guitar Parts And Live Reordings?

How do i reduce hiss on guitar parts and live reordings but still maintain quality sound?
Obviously it helps to have a quality recording in the first place but sometimes i need to take out the background hiss from other samples etc
Any suggestions would be gratefully appreciated on which are the best plug-ins from Logic Express 7.2 for this and how to tweek them effectively?

Logic Express - Problem With Audio Recording,pleaase Help!?

When I am recording guitar through an audio track, i have been told that i need to MUTE and SOLO the track before (record) enabling it. Obviously, i cannot hear the other (previously recorded) tracks as a guide to play to whilst i record. I can hear the metronome which is great but would much rather hear my music! Clearly i need to MUTE the track otherwise the 'orrible feedback loop ensues, and if i dont SOLO the track then surely i will be recording all the other tracks in the background? Can anyone help? Please?
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