Well, I don't think it would cost 250 a week to commute up, more like half that. You have to remember too that 1000 a month rent in Dublin doesn't include utilities etc. plus I still have utilities to pay in Wex.
I think you are
dramatically underestimating the financial cost of this commute.
Conservatively speaking you are looking at doing about 65,000 kms a year (and depending on where you are in wexford that could be more).
Without knowing what car you have we'll assume an average of roughly 35mpg or 8l/100kms that works out today at well over €5k a year in petrol. You'll require 3 services in that year(€250x3 = €750?) and possibly two new sets of tyres (€300 x 2 = €600?). I'm underestimating here by quite a ways.
The real killer though will be depreciation. Doing that kind of milage on a new car would reduce the value to around 25% after three years.
This are all shooting in the dark a bit and doing so very conservatively but i really think you need to run the maths on this before writing off the move to Dublin or finding an alternative locally. When comparing to a 'lesser' job locally don't exclude the fact that you are considering doing 20 hours a week without pay in order to reach the job in Dublin.
As an animal lover i appreciate not wanting to get rid of the cat but you're not even going to be home for a minimum 12 hours a day!(and i presume you'll want to sleep some of the rest). Is the cat alone during this time? Who feeds it?
I honestly reckon this whole plan needs reconsidering.
Here's a thought; For the next five days why not simulate the experience by doing the roundtrip exactly as you imagine it. Leave in order to reach Dublin at 1pm at stay there till 9pm. It doesn't matter what you occupy your time with since you
will be tired after a days work anyway.
Do it for real and see how you like it. If you reckon you can cope then you have an answer. If you found it tougher than you thought (my guess) then you can reconsider.