No slip stitching will not help you pick up from the edge!
if you slip stitch, you'll have 1/2 the number of 'edge stitches'
(200 rows, 100 edge stitches, and are like be required to pick up 150 stitches
normally you pick up 3 stitches for ever 4 rows of knitting. the exact number might vary (ie 156 or 144 instead of 150 stitches over 200 rows) but the ratio is pretty standard.
if you only have 100 slip stitches on an edge, picking up evenly is harder not easier!
practice--and remember, once you pick up the edge (even if it is a bit uneven) it is hidden. slight imperfections won't be seen.
there are time when a slip stitch edge is the right edging..but too often, its used to hid poor knitting techniques.
learn to snug up the first stitch in ever row.. this will do wonders for your knit edges.. (alternately, try working first and last stitch in ever row in garter.)