I would recommend that you use a flat iron and curve it under while doing your hair so that it isn't too too straight. I find that with using a blow dryer the ends tend to be too curly. I am not a fan of hairspray, but a high quality one will help you in this area or if you prefer, a pomade or wax will help, but beware of too much product!!! Your bangs won't look natural.
I also cut mine myself too lol i think they r great...just make sure when u do them (if u decide to do them urself), wet the hair and dont stretch out ur hair too much when u cut cuz when they dry, ur hair goes right back up leaving u with shorter bangs then expected. happened 2 me and had to wait FOREVER to grow them out. i didnt mind though cuz i experimented with diff. hairstyles!