Search your soul...
Don't do it unless you're absolutely sure you really love flying aeroplanes.
You'll be busy, working up to 12 hour shifts with only 12 hours rest in between, day on day.
The pay does not reflect the responsibilty of the job when compared to other professions.
The only thing that offsets all this is that if you're aerosexually-oriented... you'll want to be up there in the sky as much as possible (even if you kid yourself that you don't). On your days off (having moaned that you could have done with a couple more days rest) you'll be missing the flying. You'll get a buzz out of seeing so many different sunrises and sunsets, you'll enjoy the challenge of difficult weather conditions and you'll crave for technical problems to solve. You'll enjoy being sat at the threshold watching 747's swoop over you as they land.
If the paragraph above doesn't describe the way you feel about airliners / flying, then I would suggest that you shouldn't throw away what you have. It IS a very big gamble with no guarantee of success. The only way you will succeed is if you have that OBSESSION with flying aeroplanes.
So, if that's you then great. If not, save that job opportunity for someone who really does want it, as there are plenty of them.