I agree with what has been said already: drop your weight as much as you need to in order to perfect your form and manage your reps. There's nothing shameful about starting out with just the bar.
Also, I would definitely recommend a session with a professional trainer for power lifting technique, particularly deadlift. Videos help, but there's nothing like having someone there watching your every move and correcting you.
Lastly, I'd like to impart one small piece of advice that has helped me immensely with these kind of moves: suck in your gut! I used to do yoga regularly and ultimately yoga is all about core strength. When practicing Ashtanga, it is essential to tighten your core by drawing in your bellybutton and pulling up your pelvic floor. By staying tight in your mid section, you lend support and strength to the rest of your body, particularly your back. This applies to strength training as well. By controlling your breath and staying as tight as possible, you will prevent both soreness and injuries.
Good luck!
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