My only recommendation would be to not skip the prototyping phase, even if it's just a pen and paper. No matter how fast you are mocking things up in html, you'

My only recommendation would be to not skip the prototyping phase, even if it's just a pen and paper. No matter how fast you are mocking things up in html, you'll almost always going to be faster sketching it out. When I started mobile development for the first time, I jumped right into coding and I feel like I wasted a lot of time re-arranging things I could have avoided if I just took the time to sketch it out.