It is important to remember that the word 'sponsor' is not in the first 164 pages of the "Big Book".
It has aslo been my experience that people often balk at the Fourth Step by sudden needs of changing sponsors, meetings or even doing 'geographics'.
Since taking these vital Steps cannot be done perfectly, we have to just try to do our best with whoever we can at the time. Trust in that God of your understanding to take your will and your life through them.
IMO: The only wrong way to take these next two steps is to not take them at all.
Some quotes from the "Big Book" (Note the highlights!):
In actual practice, we usually find a solitary self-appraisal insufficient. Many of us thought it necessary to go much further.
But they had not learned enough of humility, fearlessness and honesty, in the sense we find it necessary, until they told someone else all their life story.
Psychologists are inclined to agree with us. We have spent thousands of dollars for examinations. We know but few instances where we have given these doctors a fair break. We have seldom told them the whole truth nor have we followed their advice. Unwilling to be honest with these sympathetic men, we were honest with no one else.
We must be entirely honest with somebody if we expect to live long or happily in this world. Rightly and naturally, we think well before we choose the person or persons with whom to take this intimate and confidential step.
If we cannot or would rather not do this, we search our acquaintance for a close-mouthed, understanding friend. Perhaps our doctor or psychologist will be the person. It may be one of our own family, but we cannot disclose anything to our wives or our parents which will hurt them and make them unhappy.
Such parts of our story we tell to someone who will understand, yet be unaffected.
Notwithstanding the great necessity for discussing ourselves with someone, it may be one is so situated that there is no suitable person available. If that is so, this step may be postponed, only, however, if we hold ourselves in complete readiness to go through with it at the first opportunity. We say this because we are very anxious that we talk to the right person. It is important that he be able to keep a confidence; that he fully understand and approve what we are driving at; that he will not try to change our plan. But we must not use this as a mere excuse to postpone.