You need to send in the WTR application and all necessary documents within 3 months from the date of the communication confirming you have WTR. After that INZ should issue you with a WTR visa, which will give you time to get to NZ and find yourself a job. Once you have a job offer and you let NZIS know, they should grant your PR.
Processing the WTR yourself shouldn't have any effect on your application (except it will save you a lot of money).
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Mother Bear 
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