Mindfulness is a constant experience...you stay aware of keeping it all the time.

It takes at least 21 days of good effort to change any attitude or mindset. It takes only 63 days to change even the worst offender of bad attitude (like someone who has been negative all his/her life to change to be a healthy positive person if they want and work on it.)

I am sure that the "ah ha" day is different for everyone. Some begin already knowing "when" they have a negative thought or are drifting off mentally...others still have to learn to notice, you know?

Begin small... like right this moment realize, tell yourself... I am reading a post on PsychCentral...and considering responding to it. THAT'S mindfulness. To not allow other thoughts in while you are doing ONE task ect is mindfulness.

It's a great way to allay anxiety...because if one can stay focussed on the here and now only, there's really no thought nor time to worry. Much success for you!