203k and HomeStyle renovation mortgage

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I️ recently started looking into these mortgage options to purchase a home that needs work. I️ understand that these require a contractor to complete the work. I️ have a few questions though that I️ can’t seem to find the answer to. 1. Who decides what work needs to be to the home? 2. This question depends on the first but could I️ use either loan for major repairs out of my ability and for cosmetic repairs do myself with my money? For example if the house needs a roof, Hvac system, renovate kitchen, baths, and flooring throughout. Could I️ use the loan just for the roof and hvac installs and do the kitchen, baths and floors myself out of pocket? Thanks in advance