how curly is your hair. i have a natural wave in my hair and get good results. dry your hair, then start to straighten working in sections from the back. paddle brushes are essential. the problem you have with getting one side the same as the other is pretty common. it takes practice, so maybe allow more time to begin with and take smaller sections on that side. a good hair straighter is also beneficial even just for special occassions. i use a GHD and it just does the job perfectly, definately worth the $$$$$$.
also, make sure you have the appropriate products for the look you are trying to create.
There is also an article featured here – how to do a salon worthy blow dry – it was great and had a fab list of products.