I always found them hard enough with a DF bike. Any advice would be really appreciated.
Learning to ride on rollers took longer than learning how to ride Silvio. I started out on rollers about 4 years ago using a Birdy folding bike with 18" tires. Two years ago I transisition to a RWD USS recumbent; Azub Origami with 20"tires.
Each time I took it slow and easy and I fell off more than a few times. In both cases I mastered the skill such that I could clip in and watch videos and not fall off too often. First I learn how to ride without being clipped in or watching videos.
Total concentration on keeping the bike upright and centered. I have a visual references directly to my front and just below the TV that helps me to stay oriented. Those visual references are about 6-10" apart and represent the maximum left/right excursion before getting too close to the edge.
This skill is totally based on instinctive reaction; no thinking involved beyond staying aware of my overall centeredness on the rollers. I have a wall to my right that is where I go when things get wonky. On my left I installed one of those orange spring mounted fiberglass poles used to mark the driveway for snow plowing. The pole provides visual and tactile feedback when I stray too far left. The spring lets the pole bend without breaking if I fall off.
When I can stay on the rollers for an hour or more and not fall off more than about 1 in 10 sessions then I graduate to clipping in. Then I start the learning process again staying totally focused on staying on the rollers by exercising my instinctive steering reactions. It's a new experience for me to rely on instinct without a lot of thinking; my brain just can't process the feedback in time.
When I can stay on rollers clipped in then I can start to almost watch videos. I focus on my visual references with the TV in my peripheral vision. Then I gradually shift my visual focus up towards the TV screen. Eventually I can master watching the screen with the visual references in my peripheral vision.
I thoroughly enjoy riding a recumbent indoors on rollers, second only to riding outdoors.