Lifting with your arms makes the bell feel awkward — it twists and drops. Pavel's towel trick gives instant feedback: the towel can't be 'lifted' by the arms, only driven by the hips.
Get into a proper deadlift setup: flat back, the bell a few inches in front of your feet. Grab the towel somewhat close to the handle. Arms are long but relaxed — they only transmit force, never lift the bell.
Take a big breath, brace the core, swing the bell between your legs, and stand up. Move aggressively through the hips, arms long, squeezing and standing out of tension at the top.