Hi Gwenallt,
Personally I don't trade of daily charts, but occasionally glance at them if trying to confirm a trend change, however I have found that the same system I was using on the shorter timeframes moved just fine to the mid term charts, I cannot see why it wouldn't apply the further out I go. I note bbjit reference to Alexander Elder's book, this was one of my first books I read when coming into fx, and the basic principals he talks about are quite good, encouraging vigilance and discipline.
I experimented with a multitude of indicators, incliding the MACD but found it gave just as many false signals as correct ones and didn't put me in tune with the market. Now I trade with trend lines, support and resistance, overall macro patterns and not too much else, and I find that by doing this, I am more in tune with the market and the emotions behind it (essentially we are all trading off the group emotions, something referred to in Elder's book I think as well), and my trading has benefited no end.
I would recommend to any new trader, to spend some time trading a virtual account "naked" without indicators, even if they intend to use indicators when they move to a live account, as a way of getting you used to the general patterns that form in the markets everyday.