Don't buy or sell all at one time. Trade in chunks.
Here is how I trade REITs
I bought 25% AGNC @ $28.82 a minutes ago. Intend to buy more as price falls
25% @ $28.50
another 25% @ $28
and remaining below 28
As price goes up sell higher valued ones and hold on to the ones bought at lower price.
This will allow cushion to buy more if the price falls further.