It's an impossible question to answer. We've been lucky, I managed to find work and we loved the summer and Autumn here (winter is rubbish everywhere!) However, if you don't find work things are expensive and you may struggle.
Even with finding work, it's a costly business - our net finances are down into the many tens of thousands, although most of this is due to refurbing the house we've bought, but financially the move doesn't 'make sense' - it's a lifestyle decision. Personally, for the lifestyle it allows the kids, and the fun we've had (and friends we've made since arriving) I don't regret it. I'm not sure my wife would agree though, she's pretty much 50/50 about the whole thing still as she misses family and friends so much. We were in a position where we had great lives back home, both had good jobs and all our friends and family were nearby - this has made it harder I think than people who move because they are unhappy.
The tips I'd give:
1 - Research, research and more research - speak to agents, potential recruiters, send out cvs and try to get into discussion before you get out here. For every good agent there are 3 bad ones who may just ignore you, but I found an excellent one who was really helpful before we came out. They are there.
2 - Consider your priorities - and really think about how much you'll miss people. It's harder than you think, and you can feel isolated at times.
3 - Remember you can always go back. My family have set a (final) decision making time of 4ish years (as soon as we get citizenship), which should give us enough time to get over homesickness if we ever will.