Manifestation newbie

Hi guys i'm REALLYYYY new to manifestation and its really hard for me to break old patterns as i'm more of a pessimist and negative person. I need tips for beginner like me. But the thing is i'm kind of in a desperate spot right now, i'm having to move out of my beautiful home and into a much cheaper place because finances are bad atm. But i need to find a new place in a months time.

If i wanna "lock in" on manifesting, do i still go on rental sites to search for rental? Or do i just lock in and do almost nothing in 3D world and just focus on feeling the state where i already found a nice home at a cheap price with good location?

If nice place comes up but it doesnt tick all the boxes i manifest, and i let it go, what if it was actually the one the universe gave to me?
Or the other way round, what if i just accept a decent place that did not tick all boxes, but it actually wasnt really the one i manifested??
In conclusion, how would i know its the one or not the one i manifest??