I use Oanda, InterbankFx, and Interactive Brokers/TWS to trade Forex.
IB has trailing stops which can be activated in TWS either by following the instructions in the help file, or by using a front end program such as Bracket Trader, AutoTrader, or Button Trader, and probably others. The spreads seem continually to be tightening, and the commission is small. However, the method used to account for the trades is obscure when one first uses it. Interest is credited or debited once daily, but not on cash held in USD unless above a minimum amount. One can trade almost anything in the universal account, pit trading being the exception with changes in even this having been forecast.
Interbank credits or debits interest once daily, none on unused USD cash, and trailing stop implementation is straightforward and incorporated in the software, which must be running for the trailing stop to be activated. Limit orders must be 10 pips away from the current price, and spreads are wider than other dealers. The Metatrader software includes straightforward accounting and reporting.
Oanda debits or credits interest continuously, including cash in USD; spreads are narrow, no commissions, and, as far as I know, no trailing stops. As I have used the charting features over time, they are more than adequate for making trading decisions. There are a number of not obvious features such as opening charts or trading data in new windows.
I have never been aware of any of these firms gunning my stops or misquoting, and within the differing pip spreads the quotes seem to be the same. One is dealing with essentially unregulated "money changers" in all cases and should learn to deal with that fact in mind, since that is the way it is.
As you will read in ET, currency pair futures circumvent a number of the drawbacks mentioned above; the "carry" features involving interest mentioned above are not pertinent in futures, and the margin requirements are somewhat different.
Good trading. Don't be so up tight about these issues, but rather concentrate on your skill in predicting direction, which is the real key to success, as usual.