Should I get a prenup lawyer?

Rather than having an attorney draft and review the agreement, you could draft the agreement yourself, then have involve the attorney(s) at the end to make sure everything looks suitable. 

Assuming for the moment that the assets are not overly complicated and the two of you are in agreement, then working with a predraft agreement can in fact save you a good deal of money. However, once you believe the two of you have come to an agreement and have a draft that's acceptable to the two of you, I would strongly recommend that you each contact a separate attorney to at least have the document reviewed. I have done this with a number of clients over the years and what the attorney is then paid to do is to review an existing document and comment on whether she/he feels it is complete or needs additional work. If on the other hand one of the two of you have significant assets in excess of your future spouse, then I think you should hire a competent attorney for the original drafting. If you take the time to enter into a prenuptial agreement, you want one that will stand up to the test of time if you're both ever dragged into court. Good luck