OK first off, the K1 is not neccessarily the best option right now. In fact, I 'm not sure what IS the best option at this point in time. Make sure you are sitting down for this. There is currently a waiting list for visa appointments for all types and the list is 28,000 cases long. The current wait is over 2 years from start to finish. You are probably better off getting married and filing for a K3 at this point because your wait will only be a month or two more and the advntages of the marriage visa far out weigh the month or two extra you may have to wait to get married. The wait has been this long for almost three years but some people are still under the mistaken impression that it will only take 3-6 months with the K1.
Yes, you can do this whole process without a lawyer if your case has no funny stuff like illegal entries into the USA or a criminal history. If your case is just plain vanilla, you don't need a lawyer and if you DO hire one, please do not listen to people who tell you that you need one from the DR. You need a US immigration lawyer. Dominican attorneys don't practice US law, and the visa is issued by the USA not the DR.
Another myth is that you have to know each other 2 years to get a visa. This is simply not true and a common misconception. The rule is you have to have MET in person sometime in the last 2 years before you file the petition.
Sorry to have to tell you about the long wait. We have a board just for dominicans coming to the USA. The address is
Dominicans to the USA
Please stop by and post your questions there also.
-Tim