I feel like there may be YouTube videos to help with this. I’ve used how-to vids on there for a number of things, and that might be the best way to do this. I think I could show someone how to do this no problem, but actually telling you would be another story.
What the heck, I’ll give it a whirl: The best way I could describe it would be to get a big fatty round brush (especially if you have short hair) and focus on the roots mostly. For a section of hair on the left side of your head, grab a chunk of your hair, and smooth it out with both hands (or a comb). Then, hold it out with your left hand, pick up your round brush, and wedge the round brush between the chunk of hair and your head. With the brush as close to the scalp as possible, pick up the blowdrier and point it onto the hair. So that you don’t burn the hair, it’s a good idea to sort of keep turning the brush and working it down to the tips and then back up to the scalp (this takes some practice). You just don’t want to leave the hot tip of the blowdrier pointed at your precious locks for too long at one time—keep things moving. But I think if you focus on the roots mostly, your hair will get a more finished look and it will have more body at the roots. Continue that around your head. As you get more used to it, you can start to use your ring and pinkie fingers to separate out the hair while still holding onto your tools so you don’t have to keep setting them down.
In my experience, even if you don’t have time to blowdry all your hair, if you get the stuff on top and in the front, it’ll get you through the day looking more or less professional. And then if you have something important like an interview or presentation you could try to tackle the whole thing.
Good luck!