When I only had a controller, i used to leave it it in library view, pick the tracks i wanted to mix, and then turn the brightness on my laptop screen to 0 so i couldn't see anything. This way you learn to trust your ears properly.
Techno is straight 4/4, BPM varies depending on the style, but you'll generally get a constant kick, and it's pretty common to have a ride on the off beat. As opposed to house, where you'll have kick, then snare/clap on the 2. Key is to just focus on the kick. As @NitroMonkey said - the mixes are longer, generally 1 min+, with no real limit to how long, as long as the tracks work together.
Find some stuff with dominant kicks and not too much else going on - learn to mix that without visual cues, and progress