Finding your way around Nagoya is easy. You just have to look at the signs.
Literal
Nagoya [at-で] way [object-を] find [nominalizer-の] [topic-は] easy. Sign [object-を] see-[focus-さえ] [conditional-すればいい].
標識を見さえすればいい uses the pattern ~さえ...ば ('if only X, then it's fine'). The さえ attaches to the object 標識 or the verb 見, emphasizing that just that one thing is sufficient. ~ばいい = 'it would be good if' / 'should.' A self-contained practical guide.