Just focus on what you want and what prices you will pay ahead of time. Then look for those pieces. Some of the sets I am working on can get expensive, so I find what quality I want (good, UNC, BU) and the plan what is a fair price and stick with that. It's when you start overpaying that you end up losing badly (since in the worst case scenario you can sell you pieces if need be)
It happened to me and I have gone overboard. I collected American coins when I was a kid up to the age of 17 and then quit for many, many years. Around 4 years ago I bought a 1855 Sicilian 120 Grana crown sized silver coin on Ebay, for the hell of it while doing my Sicilian family history genealogy . I have now spent thousands of dollars trying to complete a collection of 1735-1859 Sicilian crowns and the other smaller denominations. And the later post-unification Italian coins. I check the American and the Italian Ebay everyday in my search for the coins I am missing. Don't fall into this type of addiction
Okay.... and? You've been in this very same situation many, many times before, and this all has been discussed with/for you many times as well. There's no reason to see a replay of the past; you have to decide if you can show the restraint and responsibility necessary to collect without again cutting your own throat. If you can, great, but if not, don't, and is as simple as that. No one here can tell you what to do or can fix the underlying problems, Tim; only you can. As always, good luck.