Hey Dude. This is crazy. Dont do It. It is very hard to find a good, professional smp artist already. There are hundreds of artists doing this professional with hundreds of hours of experience and still being sh**. There are many things that can go wrong with smp too, you can go too deep so the tattoo turns blue, oversaturate so it turns into a helmet, etc. There are smp treatments for 2-3 k USD and I am sure you can find a way to make this money. I guarantee you now, if you buy a machine and let your wife smp your head, this will end in disaster, 100% and your future will include painful laser sessions which you have to pay for anyway.