do like a tiger when it hunts. RRRRRRRRRRRRRRRRRRRRRRRRRRRR Or use the link http://www.youtube.com/watch?v=XKRQMCHlONU&feature=related

Practice :) It's like italian R. it's easy - try it :)

this may sound a little weird, but: try to wiggle your tongue a bit until you find position where it sounds best. your tongue is supposed be little bit behind the teeth, not quite touching the palate, and while you are sounding the 'Ррррр' you will notice it will start to vibrate. Don't try to make it vibrate, when in right position, it will vibrate on it's own. However, there's speech impediment where some people cant pronounce 'Р' properly, at all. Where I live we call it "soft r". It ends up sounding very close to russian 'Х'. It's not very noticeable in western world where they rarely ever have to "roll their Rs" удачи!

Like in English "real", "road" etc.

The Russian sound [p] is also called cacuminal as the tip of the tongue is raised to the alveolar ridge forming a spoon-shaped passage for the air streem. But when we pronounce the Russian [p] the tip of the tongue taps very quickly several times against the teeth ridge. So the Russian [p] is a rolled or trilled sonorant: рис - rice, радиатор - radiator, реальный - real. The palatalized Russian [p`] is pronounced with the front secondary focus. The sonorants [p - p`] distinguish the meaning of words: рад - ряд.