From the perspective of a one-hour chart, it appears relatively safe to enter such positions in situations like the one described above once the two-hour, four-hour, and perhaps even the nine-hour baselines have made the turn, though it could be argued that waiting on the nine-hour moving average verges on exercising an excessive/ridiculous amount of caution.
However, an evaluation of 15-minute charts suggests that one might be able to get away with entering just after a reversal in the 70-minute baseline, so that's what I'm going to attempt, and have therefore bought both AUDJPY and AUDUSD, anticipating that I will need to hold on to them for at least a day or two, if not longer. However, the day-to-day bias/sentiment has turned bearish over the last two days, so I'm not so sure about that.