re: dumb question about stacking a tiered cake.

What are you using between your cake and fondant? Ganache may be firmer and support your cake more than frosting. If your cakes are bulging before you stack them, they may be too light to support the weight of your fondant?
If you live in a warm climate, the heat may be making your cakes, frosting or ganache too soft?
If you are aiming to make wedding cakes, perhaps saving up for a class, would be an investment towards a successful future. It will give you access to the knowledge of someone who has been training for years, and also allow you to meet people in your local area that might be able to help you out.
A wedding cake is a big part of someone’s special day… I believe you should be comfortable in your ability and skill level, before you take an order.
Keep at it… never stop learning. The best decorators did not get there overnight. Best of luck. xxx

Julez, https://www.facebook.com/pages/Allways-Cakes/450634018350115?ref=hl