if theres 4 of you and they have experience the actual swapping of the engine can be done in a couple days or a really long day lol . got a question to add bout wiring though. If you use say a glanza engine and take the ecu interior loom , fusebox and engine loom. why would you have to modify any of it ? when doin the conversion i found it easier to put the engine in from the bottom because the gearbox mount is right underneath the battery tray bit so would be a pain in the arse to try do from above.