Hey yanpfei,
Combine the deep breathing with the chant. Breathe in rhythm with the chant.
And you're not actually chanting out loud, you're just reciting it in your head.
For example, if you go very slowly (not necessarily turning the pages slowly) you could breathe in as you say "Re-" and out as you say "lax," then do that again, then breathe in as you say "4,3......" then out as you say "2.....1.......".
As long as you play with it and find something you're comfortable with and stay with you, you'll do fine.
-JackTuff13