This manual system got my attention again, since I started to experiment with manual trading on day TF.
I have found some sites that
offer 
a manual trading system for free, granted it is basic, but the most important rules are explained there. I do not want to wheedle this CAD1 system's secrets out of anyone, but it seems to me that there are similarities with the strategies that I found: trading with
resistance 
and
support levels 
, and placing pending orders. If you trade with this strategy on several pairs with limited exposure, you could do great.
Furthermore I do not think that you need an EA anymore on such a high timeframe, provided your system is low maintenance. Aren't most high-level trading systems like that? Maybe you could build one for
confirmation 
of your own trading ideas, or to give a heads up regarding a certain
currency pair 
. But an EA can never replace a good pair of eyes. Manual trading requires taking responsability for your own trading, that is the big difference with "bot trading".
Retreating to higher timeframes reduces the noise, but does not eliminate it. The tricky part of daily trading still remains if you got the direction right. Based on indicators and chart patterns you can take an educated guess, but no more that that.