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That is a tough question. If you did a good job describing in detail how to make and use your invention then the answer is "no" you do not need someone to review your provisional patent application. The question then becomes "how do I know if I did a good job?" and the only way to answer that is to have someone with experience review your files.
We review a lot of applications for people and the most common mistakes we see are:
1. People write about what their invention is and why it is great but don't spend enough time explaining it or how it works. The patent office does not care about all the great things your invention can do, they really just want to know the "nuts and bolts" about how you would build and the different parts and pieces that make up your invention.
2. Not having detailed drawings. It is important to show each and every piece of your invention in detailed drawings. A good engineer or patent draftsman can help you with this.
3. Making limiting statements. Sometimes people like to put things into their application like "the shaft in my invention has to be round and has to be 8" long and no other size or shape will work". Statements like this do not help you and may actually hurt you in the future if your competition figures out a way to use a rectangular shaped 4" shaft.
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