Hey! I have the same issue here!
I'm new to installing photovoltaic systems, but I'm a quick learner. I wanted to ask for your advice about using apps. There are becoming more and more popular, and, to be honest, what they say seems quite promising, like azimuth calcs and shadowing simulations, etc.. I mean, all the calculations scare me a bit, and having an app on my phone would defenitely make things easier... but I'm not sure if it isn't just better to ask for professional help. Have any of you used that sort of apps ? Are they worth it?