With regards to becoming an real estate investor. Is it more difficult to get financed for rentals?

My husband and I want to start investing in rental properties. We have excellent credit, excellent combined income and have cash in the bank. My question is, will we require more money down, expect a higher interest rate and find it more difficult to get approved for a loan for rental properties? I have a friend that suggested not telling the lenders that we were purchasing a single family home or a duplex for renters and to say that it was for our primary residence. What are the repercussions for saying that? Isn't this illegal? I am a big believer in karma and do not want to do anything that is outright illegal. If someone can give me some tips or advice, I'd greatly appreciate it. It is hard to tell who is telling the truth or who just wants to sell their BS real estate plans on tape for a low payment of $89.99 a month! Thanks for your time!