I'm so excited! I made my first tiered cake tonight, and it seems fairly successful! I'm still unsure of exactly how to make it super secure (I put dowel rods in, but it's just sitting on top) but as it's not moving anywhere other than MY MOUTH hehe I'm not too worried.
It's a lovely cake, nice job!
Most the time when I make a tiered cake a bit of icing between the bottom cake the the cardboard of the top cake is enough to secure it. If I'm taking the cake a further distance or if it's top heavy or tall I force a sharpened dowel down the center through both layers and remove it at the location. You may need to hammer it to get it through the cardboard between the layer.