First time roller ...

Here's a link to getting started with rollers.
http://www.cyclingweekly.co.uk/fitness/ ... dvice-6077

To get up and running try setting it up in your hallway (this will make you really popular). You can hold onto the banister and it doesn't feel like there is far to fall either direction which aides confidence.

Front wheel sits on top of the front roller.

Doorway is a better bet than a hallway, as you can just use a shoulder nudge if/when required. Or use a pair of chairs on either side which you can grab onto.

Your front wheel should be very slightly behind the single roller.

Relax the grip on your bars and try to rotate your pelvis 'backwards' to shift more of your mass towards the back of your bike. This will make the bike feel less nervous when starting off until you get more accustomed to the rollers. When setting off, you want to get the wheels up and spinning quickly.

If you get a little wobble going, then SPEED UP! This may feel counter intuitive, but the greater gyroscopic effect will smooth-out the wobble and make you more stable. Keep your pedalling smooth - rollers are great for improving your pedalling technique.

Stay away from the brakes. When coming to a stop, slow down your cadence and grab hold of the door frame/chair. Come to a stop and unclip.

That's normal, you're just lacking confidence and scared of how much a tiny weight shift makes you swerve about.

I made a mistake in my post above btw. You should rotate your hips forward and not backwards as I originally said. Imagine that you are going to ride no-handed on the road, you instinctively centre your mass, rotate your hips forward, putting your back into an S-shape. This will also lighten your grip on the bars, to the point that you're pretty much just resting your fingers on them. Having your hands on the tops will help too. You should be steering/correcting the bike through weight shifts through your hips and powering through it and not steering through your arms. As you get better at it, then you can rest more weight through your arms and shoulders and use the hoods and then the drops.

When you set off, have your gears in the middle of the cassette on your small ring and have your elbow rested-up against the door frame, to allow you have both hands on the tops of your bars. Get up to speed quickly and keep your leg speed up too, as this will help you balance. Once you're up to speed, take your elbow off and keep going. Finally, the temptation is to look down at your front wheel, but try and look about two metres in front if you can.

Looking up not down is very important, realax shoulders and go quick. Below 60rpm and I'm all over the place.