Hi @Cruiser - welcome to the forum - it is not the one most of us want to join - but on here, you will get a HEAP of support & info on all sorts of stuff that you may end up going thru. Any question - just ask away.
We have a few members in Canberra who may be able to help you out wth the local resources ...... you can add your town name to your profile, so others can see. @CathyMac
I had my surgery in mid Jan 2018, (didn't have chemo) and then had Rads and still got my holiday to Norfolk Island in late April, then went onto tabs afterwards ..... so fingers crossed that you will still be able to go on your OS trip in July. It would be terrific to be the 'reward' after your active treatment has been completed!!
From the day you find out you need more than a mammogram onwards - it is a real roller coaster ride - and your emotions can come in waves. You are OK, then sad, then OK, then angry ..... all of this it totally normal.
It is terrific that you have good friends & work colleagues who are so supportive of you. Re going home alone after surgery - if your friends have offered to look after you - you will need to be picked up anyway, so I'd be suggesting you take them up on it. I stayed at my brother's place after surgery just for 2-3 days (as you shouldn't be driving straight after - even for a week or two depending on the surgery performed.) Also, you may get sleepy from the anaesthetic .... and altho not fully immobilised, it can be awkward in the first couple of days.
All the best for your surgery in Feb xx