Just follow the instructions in the video and you'll be good to go! It is still advisable to seek the legal counsel of an experienced patent attorney, and the video is not intended to be a substitute for legal advice.

Make sure you search both columns: the pending applications as well as the issued applications. Set it to "1790-Present". Even though a patent may be expired and into the public domain, it could still prevent your patent application from being approved by the USPTO.