John Lapp

It's a very simple process that's easily done on your own by reading the guides on here. Ask questions anytime and people will help. 

if money is not an issue, DIY
a lot of it will depend on how fast you get everything together to submit

You can use your money for visits, it is a simple process, instructions are simple ! paying a service won't make it easier or faster 
Good luck 

Save your money.  It is a long and expensive process, and no service or lawyer can speed it up or cut corners for you.  Follow the USCIS checklist, and come here with questions when you have them.  Most of us have done/are doing this very process, and we’ll help you!