If you are going to risk direct pitching it make sure it swells quickly, you aerate the wort well (as was mentioned above) and the wort is absolutely below 1.060. If, during brewday the package is reluctant to swell and you haven't made a starter, pour off part of the wort from that batch (500 - 700 ml or so), aerate it well and pitch the yeast in there to "proof" the yeast then dump it in your well aerated wort once it shows signs of fermentation. If it is still sluggish have dry yeast handy for a stand by.
Oh yeah, make sure it is really fresh too. If it is older than a couple months you probably should just make a starter.