Hi. I'm used to controlling on cam sites with a nice clear video. I've been told I'm pretty good  at it. Good variation and judgement of levels etc. But I am spending less time on sites so I am using the remote app on my phone. This relies on the controlled person being able to use their phone camera to film themselves. Also because I like them to be in public they may not be in place where they can be seen to be videoing. eg. a friend just asked me if i could control her while she was at a meeting at work. In this case I'd be completely blind. Just to make it really fun she is Russian and only speaks Russian. While I'm English and only speak English. Luckily we both have found better translators than Google and we are happy for delays in chat. However that won't work in this scenario. 

Has anyone got any hints, tips, tricks for controlling blind?

I can probably work it out myself eventually but that would mean a few bad experiences for any friends who helped. Also time wasted.

I am happy to practice/demo with any ladies who want to get involved.