The first being looking for the right time, waiting for the right feel, and then taking up the responsibility. It may take some time.. a couple of years, maybe five.. During this time, there will be a lot of excuses and reason that would prevent this person from searching - maybe a new job, new role in the family, new crisis to resolve.. or maybe.. it was a smooth, comfortable life in the next five years - no reasons to even step out of the comfort zone. As time past, the heart of the person grows smaller instead of expanding - the tendency of arrogance and selfishness easily come in... what are the chances of taking up the responsibility?
The second type of person could be someone who has the mind set of 'just do it'. He may have a mindset of not being a 'leader' but to really help his friend, whom today is doing this role alone, to take off some load off his shoulder. So as he participate and take actions, he will find that his faith deepens. It's always there but taking up this role will deepen it - and it will be more fulfilling.. and later, this second guy could find the feel.. the passion.. the spirit.