It could be fairly off-putting and dangerous as well. If you are not totally sure about your partner, and you do not really agree with the way he trades, you are better start of forex trading on your own. It is also good to go through some of the free forex trading book before you start off.
Trading is simply a business! You should be completely prepared in terms of having a business plan, knowing how to trade, and being on top of them from starting to end. Even then things could break down, but being unprepared could lead to disaster. The smallest details should be thought of and prepared beforehand, but mistakes and oversights still happen.
Greed makes people hang about in a forex trade too long, or trade excessively big a size. Fear makes one get out of winning forex trades too early. Ignorance makes people entrust inestimable mistakes. Pride does not permit one to admit one is incorrect and often, small losses are permitted to turn into giant losses as one does not require accepting one is wrong. Jealousy could make one trade in a prejudiced manner.
A detached approach is a amazing asset in forex trading. Trading is war and it is necessary that you carry out a pre-planned line of action without a flaw and unemotionally. You should be flexible and let things (that are now second nature) take their course. Be similar to an outside passive observer.