If it means you understand concepts but forget to carry the one when you're adding by hand, no problem - use a calculator or a computer program.

Although my biggest skill that would be transferable to the virtual assistant space are my computer skills.

Compute the IRR for those different scenarios (can compute with excel function).

They work well, with some caveats.  1) If you don't do the computer layout at the store, there WILL be a problem.  

My point is all you need is a little motivation, consistency and a computer. 

The $1000 computer can be considered an expense regardless of whether you have the LLC ...

If it makes you feel better you can run a computation of your planned purchase and estimate 20% down and then recalculate your amortization if you want to compare apples to apples. 

When I started with computers we used magnetic cards, tapes and a green monochrome monitors.When I left the U of M soon after I met my wife in Detroit in 1988 was torn between pursing a career building and selling computers or going into home renovation where I had to most experience—I chose starting a home investment and renovation company.

If the tenant wasn't home to let the electrician in, how can he then claim that he couldn't use his home computer for work? 

If you have a computer you can get fax software to use with a scanner.