I think you really need to think this through, do a lot of research, discuss everything .. with all your family and friends,
take all their advice on board, then start looking at your potential,
then ask yourself lots and ots of questions , will you get home sick, will you adapt?.... will you be a success in a strange foreign land?
will you miss the great British Weather?
personally, i would make a point of holidaying in the country i would most like to live..... and go for one month.
That would decide it for me.
if i liked what i saw and felt in that month, i would take further steps, but not drastic ones...
feel your way through....