along the same lines as AJB suggested I usually suggest to people that they (initially) work on
any desired change by working with each bell in the change in order. This can either be done by working front-to-back, or back-to-front. Your preference might be affected by how well you can see each change and your calling style (bell-up or bell-down). As you gain experience you can play-around with how you reach different changes.
As an example - moving to Queens and back to Rounds building each change front-to-back:
1-2-3-4-5-6 (1 is already in the right place, 3 is not. Currently 2 is in the way of 3. Call 2-3)
1-3-2-4-5-6 (3 is now in the right place, 5 is not, currently 4 is in the way. Call 4-5)
1-3-2-5-4-6 (5 is still not in the right place, currently 2 is in the way. Call 2-5)
1-3-5-2-4-6 (5 is now in the right place, as are 2, 4, and 6. Job done]
1-3-5-2-4-6 (2 is out of place. Call 5-2)
1-3-2-5-4-6 (2 is still out of place. Call 3-2)
1-2-3-5-4-6 (2 and 3 are in place, 4 is not. Call 5-4).
1-2-3-4-5-6 (Job done)
Building from back-to-front the changes would be:
1-2-3-4-5-6 (6 is already in place, 4 is not. Call 4-5)
1-2-3-5-4-6 (4 is in place, 2 is not. Call 2-3)
1-3-2-5-4-6 (2 is still not in place. Call 2-5)
1-3-5-2-4-6 (2 is in place, as are 5, 3, and 1. Job done)
1-3-5-2-4-6 (5 is out of place. Call 5-2).
1-3-2-5-4-6 (5 is still out of place. Call 5-4)
1-3-2-4-5-6 (4 is in place, 3 is not. Call 3-2)
1-2-3-4-5-6 (3, 2, 1, are all in place. Job done).
HTH