Be very cautious and careful flying a new plane without an instructor experienced in THAT plane. Every plane is different.
There is one model of 172 that has the gas pee valve in the cockpit. Guy flew it and had never flown it and the CFI, well, I guess he never had either, not sure. Anyway that knob looks like a heat knob and the pilot pulled it. Its on the pilots left. The CFI didn't notice. When you open that valve in flight, it leaks gas. All the gas leaked out in about 1/2 hour or so and they had an engine out. They weren't injured but the plane was totaled.
Its always better to get some instruction (once you are a pilot you can get instruction from anyone, just don't log it) in a new plane to you.
Sure, there are CFI's who have and will fly "anything". (although I haven't met any yet).
Some bully is going to say "Ah, you don't need any instruction in that plane, just hop in and fly it! That what I do! HAR HAR HAR" See, combating THAT is the hard part.
If you are careful and cautious and the plane is not too different, it can be done. It's a bit risky though. Proceed with caution.