When reading instructions for how to make a special stitch oryou should always
'translate' as the opposite side to what it says. (with 'right needle...' or 'from the left side...' etc. should be with the 'LEFT needle..." or from the RIGHT side...")
When it comes to deciding which derease to use, not only is your knitting mirror image, your increases/decreases are also turning out mirror image, so except for a very few cases (usually to do with following charts and cables) you always just use the increase/decrease it tells you to, and they should turn out just fine
I hope this helps - I'm pretty bad at explaining specific techiniques, and i always have to read instructions for increases right before I work them, I always forget which is what and which way it leans...