Hey Mate,
Billy has a point private wedding days a a bit of a cursed subject in helicopters but if you really want to do it you should:
1) Stay light (take 1 or 2 light pax)
2) make sure there is a clear easy to approach flat large area to land and maybe drop in there with an instructor prior to check it out
3) make sure everyone on the ground is briefed to stay well away and have someone on the ground with a radio you can trust
4) Make sure that you have a back up plan and use it if the weather is in any way unfavorable or looks like it might turn that way.
5) Or fly in duel with an experienced pilot (probably the best option)
Realistically as long as you careful and calm you should be able to do it but make sure you know exactly what your plan is and stick to it and if you feel uneasy just cancel it.
In terms of finding a R44 there was a company
http://skysharehelicopters.com.au/ that used to do this stuff in Hobart don't know if they still do but there website still works.
Also you could ask
https://paravion.com.au/helicopters/ as they have an R44 but don't know if its there or available.
Only other ones I know are up north with cradle mt helicopters and Hali-adventures guess you could always ask them.
Disclaimer: this in no way represents legal or expert advice so don't crash and sue me please.

(actually just don't crash)