Hi Mouse,
I guess the unfortunate fact is that no one is going to know how effective your DIY Will is until you die and it comes into effect!
I've heard some anecdotes about these resulting in confusion re the estate but those stories could have been generated by lawyers who of course have a vested interested in suggesting they are no good.
You can get a free Will done by the Public Trust. They can offer you advice.
They do this, I gather, on the presumption that you will nominate them as Executors and when you do die they charge a very hefty percentage of your estate to administer it.
To get a lawyer to do it probably wouldn't cost all that much. I think I paid about $120 about five years ago.
Good luck.