The most difficult thing to adjust is the action, which is considerably higher on a properly set up classical guitar.
On some instruments Hard Tension strings are a must. Since you've made a transition from steel strings, higher pressure required of your fingers should not be a problem.
Please, remember, that in the classical world, technique plays a greater role in tone production. Much greater than strings do.
A change in guitar position may result in a change of angle of attack that will turn your warm and mellow tone into a shallow and thin "plucking" farts;-)
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Nylon string are softer, but harder to play 
Alhambra 11P
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