Answer 1) Trading 3 pairs with 1 lot for each pair yields an account risk of 2%. This is OK.
Answer 2) Manually closing a trade does not affect the EA. It will continue to function normally.
Answer 3) If you are going to trade with EA’s then you need to have faith in them and not be changing their parameters or manually close the trades. Having said that I will manually close a trade if it is close to the TP and I see it is starting to reverse directions. This is the only time I will close a trade.
Answer 4) Use a calculator to set lot size, etc. https://www.babypips.com/tools/position-size-calculator
Alan,