Please consider someone who is working in a company and is not satisfied with his working conditions and decides to open his heart to one of his co-workers. The colleague notices that he is thinking about resigning; therefore he is going to sympathize with him and wants to give his advice and say "First, find another job and then quit working there." Does the self-made sentences below sound natural to you:
- First, make sure you have somewhere to go then quit working there.
- First, make sure you have somewhere to work then quit working there.
- First, make sure you have something lined up then quit working there.
Note: In my mother language, we have a simile. In such conditions we refer to a hiking or mountaineering in rocky places / mountains when a mountaineer wants to go up the rocks, first they must make sure that they have stepped on a solid and confident peace of stone and then step forward; otherwise, they may fall down the rocks. So, this is the expression we use in these situations and say:
- You have to make sure that you've put your foot on a confident place on a rock and then step forward
- You have to find a job and then quit working there.
This is the fixed expression which I am looking for its equivalent in especially AE