Understanding similarity in geometry can be tricky, even though it can help solve problems.

1. Ratios Can Be Confusing: When dealing with similar triangles, you have to think about the relationship between sides, like how $a/b = c/d$. This can get confusing!

2. Too Many Theorems: There are a lot of rules about similarity (like the Triangle Proportionality Theorem). This might make things feel overwhelming and lead to frustration instead of understanding.

But, using visual tools like diagrams can really help make these ideas clearer. Also, focusing on the basic properties of similar triangles can help you use these concepts step-by-step, which makes proofs easier to handle.