It depends a lot on your hair type. My friend pete has really good hawk hair and can get his almost perfect every time, but my hair is a bit more hit and miss (I've even had pete do my hair and it not turn out as well as his).
1: take a shower, shampoo and condition properly
2: dry off
3: blow-dry your hair until it's completely dry and starting to get fluffy (comb hair while it's wet, use a brush when it's just damp)
4: Brush it a bit more
5: Pull up sections of hair with a comb hairspray the base and blowdry (do this all the way along the hawk. Some people find it best to start in the middle, so it's more even)
6: Spray the tips
7: Patch it up, if there are any holes or gaps in it grab the two sections either side and pull them together, spray and dry (might take a few coats of spray).
That's pretty much it. Look at my pics for how long my hair is, takes me 15-20 mins (excluding shower and drying).
the only problem with conditioning your hair is that it might weigh it down depending on the product. And honestly, you don't need to wash your hair everyday. It's not healthy for it. ..But then again, neither are mohawks.