Idea by: Dmitry Tolmachev.
MQL5 code by: Vladimir Karputov.
Assistant EA: It moves the positions to a breakeven, after which trailing is enabled.
Examples below shows how to work with default parameters:

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Code original : https://www.mql5.com/ru/code/20636
TwoBarsComparison
The EA compares the opening prices of the zeroth and the second bar. It moves positions to a breakeven and/or enables trailing.
exp_Amstell
The EA uses a virtual Take Profit for closing gaining positions. Opening positions with a step. Catch the type of the last position and its price in OnTradeTransaction.
e-News-Lucky
The Expert Advisor places pending Buy Stop and Sell Stop orders. If orders execute, the trailing stop is run for the positions.
SSL2
Two different-period indicators SSL, implemented as a colored cloud.