My experience has been something like that. I am alcoholic and went into recovery in AA 4 and 1/2 years ago and have remained sober. I am able to help others recovery from alcoholism who want to, in the same way that I was helped. While it could go back in quite easily, for now that particular beam is 'out of my eye'. I don't judge or condemn others who drink though, even if they drink alcoholically. I simply offer them a way out and the same help that I was given if they want it.
On the whole though, there are many 'beams', and yes they need to be removed and worked on. Lust, selfishness, laziness, wraith, pride - the usual suspects. These are things that are not always so black and white and we all have them in various shades. I went through a period recently where I hated my neighbor, rather than loved him. And I was pretty judging and condemning while I was doing it. So, I feel like it's safer to repent and keep myself recused from the bench in general, on top of that fact that I've been commanded to (for my own good, and I suspect, the safety of others). I'm simply not qualified. Helping people on the whole seems both the better way to go and the way to get better, and we are the best witnesses for deliverance in the areas we ourselves have personally been delivered from.
Luke 12:1 "Beware of the leaven of the Pharisees which is hypocrisy". I think that was not just him saying "watch out for those guys." I think what He meant was, "watch out for this in yourself."