for what it's worth...
it depends on what type of business plan you're talking about. if you're talking about a full-blown b plan with an executive summary and all the catagories offered from professional software, then i'd say that would be very difficult.
it depends on your level of knowledge about rei. are you just starting out?
i'll just guess and say that you are.
k, this means the best way to just get through it all is to have some long range goals and some short range goals in place, even before you start thinking about a "business plan".
you can't write one, if you don't understand the business. rei is not a traditional business. it's investing and relies alot on speculation. if you're doing rentals, it's easy to say, okay, my customers are my tenants and my homes are my inventory. okay, you've got 5 homes (inventory) and 5 tenants (customers).
now sell your "business"...you can't sell it, because there is no business, per se. there are two types of business, a lifestyle business - being self-employed and a business with saleability - one that has a system of operations, trademarks, management or potential for it, and basically a system of controls, customers and market share that make it worth something to an outsider who wants in.
rei doesn't really offer these opportunities, at least NOT TO THE NEW INVESTOR. the noob, really needs to learn about rei and then get that first investment property.
now, getting back to the long range goals and short range goals. once you know where you're going and understand, for real, the costs, benefits and risks of rei, be it in your local market or across the country, in my opinion - a one to two page business plan will suffice. it must lay out a simple plan, give you a sense of financial direction and be flexible enough to change when you run into problems down the road.
for instance, the terms "seasoning" doesn't often register loudly in the rei field, but it is something that you will face down the road. your business plan should take this into account so that you are prepared for it.
sorry for the long ramble - bottom line - just writing a business plan out of thin air ain't all that easy and something like:
buy
fix
refi
rent
won't cut the mustard. at least not in my experience. i mean, it's not a whole lot more than that when you break it down, that's why i said 1 to 2 pages. and heck, alot of investors may tell you you don't need one at all, just go out and start buying! your business plan will rely heavily on your strategy for buying property. this is a definite. KISS method a must.
good luck.