Angela, I would NOT suggest using a hair dryer! The fan in the hair dryer will blow your EP everywhere! and the heat gun is much, much hotter than a hair dryer.
Heat guns are probably less exspensive than a hair dryer, too. The pink one I use in that tutorial? I bought it at HL when it was half-price, so I paid $5 for it. Or wait til HL has a 40% off coupon and use it, which would make it $6. If you don't have a HL near you, I'd be glad to pick one up for you next time they're on sale/have a coupon.