Is a 25 unit apartment complex too ambitious for first buy and hold property?

[Kellie Holly-Wood]

I want to get serious about creating a real estate business of buying and holding, specifically apartment complexes. I have a moderate knowledge of the real estate world, but have never been a landlord. I have one 4 unit complex in escrow, but also have the opportunity to do a 25 unit complex. I want to know if I'm being too ambitious. With little experience as a landlord/ manager should I work up to it a little more?