Lots of my buy orders have now executed - including the Reddcoin one at long last. Am now waiting for the sell orders to execute. With some coins such as Digibytes and Noblecoins, the sell orders have already executed - see screenshot below.
As per my plan, I have simply placed new buy orders for those coins. Once the sell order on Reddcoin executes, I might decide not to trade that coin anymore. As I am only trying for a small 5-8% profit on each trade, it's important they execute quickly. If I have to wait a week for a buy order to execute and then another week for the sell order, and all for a measly 5% profit, I'm just never going to get anywhere.
So far the coins I've tried have been Reddcoin, Noblecoin, Digibytes, Devcoin and Mazacoin. Noblecoin and Digibytes look promising for a quick turnaround.