wait for a RETEST (where price closes above the previous level of resistance)
Once price confirms resistance as a new support (floor), it is safe to enter.
Price doing this is a shift of momentum
wait for a break of support (floor)
wait for a RETEST (where price closes below the previous level of supports as a new resistance (ceiling), it is safe to enter
Price doing this is a Continuation of an DOWNtrend.