Again, maybe thing is about being brave and just jump in without thinking about possible issues that may never happen...
Regarding eviction, I meant more, that you will be able to have some savings to bridge gap between two jobs or if it gets to unforeseen illness or event. Like what happens if you both lose jobs, or you need take care about your spouse ... (I hope that never happens). But, my only point was that system is adjusted so you are always on the edge (regardless where you are), so you always turning that economic wheel ...
I have few mates they have miscalculated amount they can borrow, forgot to include other expenses, service charges etc. now they really struggling as mortgage is eating most of their salary, they have very little room for any maneuver.