This the only step as far as I know in the AA book which asks me to be "convinced".
Convinced of what? Convinced that we were in the right place- "we were at Step 3".
If I am not convinced, then I need to go back to Step1 and Step2 and see what it is that I am not convinced about. If I am not convinced about Step1 then it means I am not powerless and I don't need Step2 which is power. That is why over 60 pages of the AA book is written to explain just the first 2 steps. And again to convince.
"The first requirement is that we be convinced that any life run on self-will can hardly be a success." If I cannot run on self will then I got to run on God's will. Sound simple, but me being an alcholic cannot accept this. I have got to be convinced. Large uncontrolled quantities of alcohol saw to it that by the age of 28, I shall definitely be convinced. Hence the so called "rockbottom" was completely and utterly reached. No further convincing was necessary. "We were in a position where life was becoming impossible, and  if we passed into the region from which there is no return through human aid, we had but two alternatives: One was to go on to the bitter end, blotting out the consciousness of our intolerable situation as best as we could; and the other, to accept spiritual help." Well Step3 is the start of that process. If you are new to MIP and you want to join on this spiritual journey, Welcome.

Clear instructions on how to do Step3 are on pg 62 BB. "This is the how and why of it. First of all, we had to quit playing God. It didn't work. Next, we decided that hereafter in this drama of life, God was going to be be our Director." For most of my life I did what I felt was right. I was stubborn and behaved like I had all the answers for everything including alcoholism. But alcohol became my master. I was the slave to a chemical. It dictated how I lived and nearly took my life. The more I fought the more I lost and eventually succumbed to the reality that I was an alcoholic. I took 3 steps to get sober. I admitted I had no power, believed in a higher power and decided to let that power direct my life. I would have died and become a statistic if I had not done this. The same thing that the 1st hundred people did. What happened as a result of this? The first thing I found was I did not need willpower to stay sober. I stayed sober naturally as if I did not drink alcohol in my life. There is a prayer on pg 63 BB, which I had used, to take this step. I found that God does not make too harsh a terms for those who seek Him honestly. This was the biggest stumbling block for me, because of pride [intellectual rationalisation] and worship of other things [job, money,car etc]. My rockbottom ensured my taking this step sincerely. Beyond rockbottom for me would have meant death for sure.