Tom Askey

I'm looking for some clarity. I own 3 properties. 1 has a mortgage, the other 2 don't. I'm looking to add my wife onto the properties as a beneficial owner, I will retain legal ownership. I would like to either have her as 100% benefactor, or split 90% to her, and keep 10%, I'm seeing a LOT of conflicting/confusing information around how to make my wife a beneficial owner. Some are saying it's just a form I can complete, others are saying it has to be done via a solicitor. I've seen multiple recommendations for a Deed of Assignment, Deed of Trust & Form 17 and I'm just confused as to what is actually needed. Some say I need to actually change the official property deeds too. Please can you CLEARLY advise, step by step, as I want to do this correctly. 1. What forms do I need to complete? 2. Where do I get them from? 3. Do I need to involve a solicitor?