I second Dave's comment about Level 2. I approached trading with a chartist's view, and training one-to-one with Richard (Mr Charts) over 2 years ago.
I wouldn't attempt to trade without Level 2. I think Richard who is primarily a chartist wouldn't trade without level 2 either.
You just can't see what is really going on with a chart and a time/sales window. In a fast market, the order book can move a long way from the last charted trade and several seconds can elapse before the next trade prints on the chart. I use eSignal for both charts and level 2 so it is not as though I am seeing a discrepancy between different providers.
Some prefer to highlight the "Ax" for each stock. I have the seven big players highlighted in different colours so that I can see them all the time whichever stock I am looking at, (Goldman, Lehman, Merrill, MorganS, Knight, Citigroup and UBS).
I look for gaps in the book as a guide to probability of the direction of a move to support my thinking. If I don't see a gap or it is on the wrong side of the book I will think twice about taking the trade because my thinking is not being confirmed. By "gap" I mean whether or not there is a continuous progression of prices or if a few get taken out is there a gap to next resistance/support. If I have a chance of capturing a gap, it helps.
Is there a spread? Can I trade it? I switch between market and limit orders accordingly.
Via-trader helps me get to the action. Alan and Aboudy have developed a fine tool.
I was at the click-events Heathrow seminar a couple of weeks back, just in front of Lee on the other side of the aisle. I was the one asking Alan the awkward questions
Shame there's not been much follow-through the last couple of days. Let's hope Bernanke's little chat with Congress brings the volatility back.
Edward