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" HOPE " is not really one of the concepts we use for dealing with AC systems... as they are really about pure physics. If you violate a rule it will bite you either with having to do it over again, or blowing your compressor or something else which will waste time and money ...
One was great.
Two can probably be skipped if it is clean.. however, to do a proper flush you will want to use the old expansion valve as a ' tool' and so you will need a new one.
Three is a very bad idea.. lots of threads about alternative refrigerants..
USE either R12 or R134a.
If you are ready to accept those premises post and let us know.. we can get you to where you need to go in a logical manner... and will strive for ' as cheap as possible ,but not cheaper )... in other words... you can shoot yourself in the foot trying to cut too many or certain important corners..
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