On a 4 lane road, when to get in left lane to turn? So much depends on the road and traffic conditions. Experience and intuition come into play as well.
Generally, signal your intentions clearly and early. Always be patient and wait until you are sure there is a motorist behind you that is assisting you by yielding. Merge left one lane at a time in this fashion. Always be certain you have gained motorist assistance before merging.
Once in the turn lane, hold the middle position until you have completed your turn.
If you don't feel comfortable merging left at a given intersection,
it's perfectly legal to stay in the right lane, cross the intersection and prepare to proceed when the light changes again, using the right lane. Just be sure you do that safely, as well.
Always work with motorists.
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No worries