Two years ago I was in your shoes...I understand exactly what you are going through! I shopped for a LONG time and here are my takeaways:
1) Hiring an "expert" carries its own risks...a 'big name' I called wanted nearly $5,000. Of course, if he saves you from a disaster it would be well worth it. Thing is, when you read the 'fine print' even the 'experts' won't guarantee their 'work.' In the end it's still a crap shoot, I'm afraid.
2) A premium, but buying from a well known broker/dealer like Jimmy Garrison should be considered. Again, no guarantee, but guys like that wouldn't be in business this long if they were selling lemons.
3) Finding a plane that has been consistently flown 50-100 hours per year for at least the last five years improves your odds greatly! I was shocked how hard it is to find planes that meet that criteria. Most are un-flown dogs, I'm afraid. The plane I ended up buying had been flown nearly 100 hours per year for over a decade. First annual found no ADs open, and only $2K in needed work.
4) Don't buy a 'bargain' unless you like to restore vs. fly!