Morning guys... any hints/tips on how to replace fuel injectors on a VF Clubbie with the LS3 SV340 engine?

Thing dropped some cylinders yesterday on the way home , scan tool said 'misfire on #1,#3 and #5' Bit obvious that!
but rather unhelpful that message! Replaced the plugs on the whole left bank (as 2 of those had no centre electrode!)
Still missing and scan tool now said 'Ignition misfire on #1 and #3 so replaced the coils and plug leads.
Damn... still misfiring! and finally the scan tool says - Injector failure, open circuit Cylinder #3

So next.. replace one (or more) fuel injectors! Genuine Holden service manual is a slow step by step how to slog
starting with WAIT 2 HOURS before commencing any work on the fuel injectors/fuel rail after last engine run
Blimey...

TIA