1. No special tips, the process is more or less the same regardless of the status you're AOSing from. There's just the additional documentation required from J1/J2 which is already listed on the I-485 form Instructions:
"Documentation Regarding J-1 or J-2 Exchange Visitor Status If you previously held or currently hold J-1 (principal) or J-2 (dependent) nonimmigrant exchange visitor status, you must submit copies of all relevant Forms IAP-66 and/or Forms DS-2019, Certificate of Eligibility for Exchange Visitor (J-1) Status, ever issued to you (if available). You must also submit copies of all available J-1 or J-2 nonimmigrant visas issued to you, and copies of all available Form I-94 and passport pages with entry stamps showing your admission to the United States in J-1 or J-2 status. Form I-485 Instructions 03/29/21 Page 15 of 43 In addition, if your J status made you subject to the 2-year foreign residence requirement of INA section 212(e), you must submit documentation to show that you complied with the foreign residence requirement, have been granted a waiver of the requirement before filing Form I-485, or were issued a favorable waiver recommendation letter from DOS before filing Form I-485. You can show you complied with the requirement by submitting evidence to prove you resided in the appropriate home country for at least two years since your exchange visitor program ended. For information about waiver of the requirement, see the Instructions for Form I-612, Application for Waiver of the Foreign Residence Requirement."
2. This is a DIY forum. Several selectees previously on J1/J2 successfully went through the AOS process without the need/use of a lawyer. However if you personally feel you may need a lawyer, you can hire one. Just be aware most immigration lawyers are not DV based AOS savvy. We've actually had reports of lawyers causing more harm in the past, or of some who hired immigration lawyers but still ended up doing the heavy lifting themselves - those folks still ended up in this forum seeking guidance on how to progress their applications.
3. Again, this is a DIY site. I don't have the time to track that. Of course there may be DV22 folks who already hired some immigration lawyers currently in this forum, they may be willing to identify themselves to you.