I'm having a bit of trouble understanding how this question is different to your previous question: Good things happen when I’m feeling negative and bad things when I’m positive - WHY??

Or, at least, my answer would still be the same.

Your beliefs act like a kind of self-regulating thermostat in your life.

If you have more in your life than you believe you should, you will find ways to lose it until you come back into your comfort zone. e.g. you will have an urge to buy something expensive, your car will break down with expensive repairs, people you feel obliged to help will ask you for lots of money...the physical manifestations of your limiting belief influencing your life are endless.

But it works the other way around too.

If you have less than you believe you should, you will find ways to draw more into your life. I've noticed in my own life that once I reach below a certain financial level, money seems to come out of nowhere in surprising and unusual ways. This time it is a limiting belief (from the other end...the end we don't complain about!) just pulling my life back into that comfort zone again.

Ever noticed how millionaires/billionaires who then go on to do something disastrous and lose most (or all) of their money then make it back again very quickly? Their life circumstances may have changed but their beliefs regarding prosperity have not, so they make it all back again...and usually more too, because of the added desires that have been launched as a result of the adversity.

Donald Trump is a prime example of this.

It is worth considering that just feeling good or being in the Vortex does not change your dominant beliefs about anything by itself.

It could well be that if you keep yourself in the Vortex long enough, you get positive manifestations of things that you want which now make you believe differently about your ability to get those things but it's not guaranteed.

As soon as you hit against a limiting belief that triggers you into a bad feeling vibrational state, you will find yourself ejected from The Vortex because you are no longer a vibrational match to the other (vibrational) things in there i.e. all the stuff you desire.

It's still no problem though...it's the way life is supposed to work.

I know it might not seem like it right now but life is not really about getting all the stuff, life is about that constant, on-going re-alignment with The Vortex.

You can think of being in The Vortex as taking a long, relaxing vacation where you sit around and do nothing. But there will come a time for everybody when they get bored of that and want a bit of fun and excitement, maybe even danger. And after doing all that, you appreciate the next vacation even more. :)

I find it really easy to visualize myself enjoying the salary and benefits but suddenly a little niggle of a doubt comes up saying what if I don't get it?

Reading through your question, I wonder if this statement represents where you are tripping yourself up with manifesting the life you are after?

It sounds like you've stepped into needing the manifestation to happen, rather than just enjoying the process of letting it unfold. I can understand why this would be the case, based upon your previous descriptions of your life situation, but nevertheless it's a major obstacle to getting what you want.

As much as we may not like it, the Law of Attraction is absolutely consistent.

That absolute consistency is both our greatest friend (when we are in alignment) and our greatest enemy (when we are out of alignment)...so it's up to us to find a way to change...because the Law won't.