You are constantly manifesting things all the time.  Your day to day life may seem insignificant in a lot of ways, but it's absolutely manifested and is tuned in to your belief system and the thoughts that are running through your mind throughout the day.  You do most of this on auto pilot, but the great thing is that any part of your life can be tweaked at any given moment.  You just need to tune into the new frequency and life always responds

With bigger goals, sometimes it seems like it's more difficult to change that frequency.  Sometimes it may seem next to impossible! But, remember any current obstacles are just a result of your current frequency and thus they can change! So, let that thought make you feel empowered.

I think that manifesting a big goal is so simple that we usually complicate it through emotions and worry.  But, remember the simplicity of creation.  You imagine/feel, allow and then it is.  The allowing part is where people usually get confused, and I would suggest to just go with the flow when trying to manifest something.  Don't judge anything as bad or wrong - just let it flow and feel as good as possible!

I hope this helped and have a wonderful day :D

Veronica