What country are you moving to moreleftpedal?
Converting the PPL should be the easiest part of the plan. You will need a medical, a R/T Licence, pass 1 or 2 exams, pass a skill test and deal with a lot of paperwork... but don't quote me on this there will be someone else here who actually did it and will know better.
However if we are talking about a private instrument rating and not a CIR then it is not recognized in JAA/EASA-land and you cannot convert it. So if you have all necessary FPAs on your PIFR think about doing the CIR checkride before you leave Australia to make it an ICAO rating. This won't save you from extensive ground school but reduces you conversion training to 15hrs (instead of 50hrs for a new IR).