This may be a little premature on the "success" side, but thanks to the support from BP, the BP community, friends, and family, I am now racing down the path of buy-and-hold rental property and becoming a landlord.  

What I don't want to do is give them notice prematurely since I will then be stuck carrying two mortgages at the same time by my self.

All your questions are very premature base on your self education.

Or to not wait the length of time to get full tax benefit and sell and incur tax prematurely and unnecessarily.  

I am sure I aged prematurely on the first deal, but I sure learned a lot. 

If you are not raising the rent on them, it shouldn't be a problem.If you want to prematurely raise the rent, they should have an issue with that.  

Only one call to take off mailing list.I'm considering stopping the mailing campaign to List B but it might still be premature.

As such I would rather keep an overly “communicative” paying tenant there than deal with turnover by excusing her from the lease prematurely.

Keep sand an stage 2 road base far away from your turf, the road base will get hard and not drain properly while the sand will rub on your new grass and prematurely wear it down. 

I often drive by the many I sold prematurely to survive in the 80-90's when rates were 18% & I had too many rentals & too much debt & rehabs to juggle while still working.