How do I patent my invention without a patent lawyer or that type of service? -

I do not want to use any assistance when patenting this, is it possible?

Yes, it is possible. Just like representing yourself when you are the defendant in a capital murder case. If your wonderful invention is really good then some crack lawyer will ravage your original patent at the most inopportune time. They ll watch how your new product sells. If it does well they ll pounce, maybe extorting a percent of your profits so they wont challenge your patent. No. Not a good idea. Do it right. First, troll the USPTO database (link below) for keywords regarding your invention, to see if it has already been invented. If it passes this test then you re going to need some bucks to do a real search of patent and non-patent (prior art) literature.