Actually you have a month to renew your road permit after it expires. Hence start the process on the day it expires if you so prefer. You need to get the technical examination, I think the afternoon around noon should be good to go for it. The report is valid for a month, assuming nothing is wrong with the car , u then go straight to the traffice dept. There is a place in Wakrah where you could get the tech inspection done, however as in the past it may have relocated.