Adjusting XT disc brakes?

I'm new to disc brakes, and have two questions. Firstly, how do I adjust the
travel distance of the brake lever? Secondly, how do I adjust the distance
between the brake calipers? The front calipers seem to be in a semi-closed
position at all times, which makes it impossible to get the wheel back on
once its removed. Do I need to 'bleed' the brakes? TIA.


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