This was my problem that I had this past weekend. My hair was about 75% dry and I wanted to smooth it out some with the blow dryer. I had a brush in one hand and the blow dryer in the other. It was too tiresome, awkward, and time consuming this way. I was thinking about getting one of these...
Jilbere Ceramic Tools Hot Air Brush from Sally's....$19.99 (or $17.99) w/ card.
I tried using the pick attachment for blow dryers back in the day when I was relaxed in the teeth would break off in my hair.
If I don't get the hot air brush, I'll get something like this to hold my dryer while I use the brush...