Sorry, I need some more help please

It's gears again - I just can't seem to follow instructions :cry:

I've put an X0 rear mech and shifter on my bike (new cable) and at first the lever felt tight when trying to shift down the gears and it wouldn't shift into the lowest gear at all. Then I fiddled some more and now, it's all over the place!

How do I do it properly? What I did was...

Put it in the highest gear front and rear
Set the H limit screw
Put it in the lowest gear front and rear (I had to move the chain myself to get it in the lowest on the cassette)
Tried to set the L limit, but the screw wouldn't move the mech over enough to line up properly and when I turned the pedals, the chain went back on to the 2nd cog.
Then I went to Tesco.

Does anyone know what I'm doing wrong? Where does the b screw come into it all? Is the cable too tight? I also just read a thread about not having enough of a loop of outer cable going into the mech - I chopped some off mine today because it looked too long for this mech and the cable was cut for a Deore mech.

Any help much appreciated :D

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