two huge time saving modelling tools I use for organic modelling are free form deformation tool and sulpt's smooth tool.
for ffd's... just select the vertices around an area you want to work on and create it (the more divisions the more precise deformations you can achieve). Then just select latice points near the vertices you want to deform most and start transforming (trans, rotate or scale).
This is better than pushing and pulling vertices manually since it allows smooth drop offs of deformation so it's less harsh. Experiment with how each lattice point deforms the geometry it envelopes and you'll get how intuitive it is...
The sculpt tool's smooth brush you already know is for blending harsh areas. note: it does seem to slightly shrink the geometry so you might have to go back to ffd's to ajust the scale.
This is generally for when your model get's more complicated and dense.
Hope this helps.
"Whatever tomorrow brings I'll be there...with open arms, and open eyes" - Incubus