Proposal to PhD / ownership

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Hello everyone
I am new here. I am in the initial stages of my PhD. The broad area is psychology. I wanted to ask people who are a bit (or a lot) further along than I am how their PhD developed from their initial proposal. How much did the plan of studies and details change once you had read further into your research area? Also if anyone has any tips about getting the ownership of their project then that would be very much appreciated also.

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