etias

Don't worry about it too much.

September would still be 3rd quarter, it only applies for your entry, not while you are there.

If it does roll out as early as September, you will have plenty of notice, your airline will contact you, you will just go online answer some questions, likely scan your passport, maybe take a picture, pay a fee, and most people will be good to go.

ETIAS is for entry into the EU.

Good to know. I thought it was for entry into Schengen.

ETIAS in a nutshell

ETIAS travel authorisation is an entry requirement for visa-exempt nationals travelling to any of these 30 European countries

European countries requiring ETIAS

These 30 European countries require visa-exempt travellers to have an ETIAS travel authorisation:
Austria Belgium Bulgaria Croatia
Cyprus Czechia Denmark Estonia
Finland France Germany Greece
Hungary Iceland Italy Latvia
Liechtenstein Lithuania Luxembourg Malta
Netherlands Norway
Poland Portugal Romania Slovakia
Slovenia SpainmSweden Switzerland

Schengen countries:
The 29 Schengen countries are: Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, and Switzerland.

Lots of overlap but not a 'perfect' match

ETIAS has not yet been implemented. They are rolling out EES the entry and exit system at the moment. Which happens at the airport.

ETIAS will follow at some point but not yet. This will be done on line when it is introduced.
Very similar to the Esta needed for the USA.

If anyone has advice, it would be greatly appreciated

Do nothing, as there's nothing to do.

There is no guarantee that ETIAS will come out in the last quarter of this year. It has been postponed numerous times over the last three+ years.

When it does come out, you will get plenty of notice.