Here's my story:
35 years ago I bought a house and rented it out, it was my first venture into buy and hold REI. My tenant lived in the house for 14 months and I got a total of 4 1/2 months rent. He trashed the house so badly I sold it to the church across the street at 75% of what I paid for it and they tore it down. I was lucky to get that much for it. This experience left a bad taste in my mouth and I gave up the idea of residential investing for 33 years. February 2019 at the age of 62 I accidently came across a screaming deal. I bought a mobile home on 4 lots, sold two of the lots and rehabbed the mobile home. This property appraised for almost double the amount I have invested. I have had a good tenant in the property now for the past 19 months. I liked how that worked so I bought a couple of lots with a mobile home hook up and pad already in place thinking I would buy another trailer and set it there but I ended up renting it to a lady who parked her own home there. By now I had the bug so I began looking and I found a house off market in July of 2019. I bought the house rehabbed it, (for way more than I thought it would take) and placed a tenant who has been in the house for 9 months and has given me no problems. I bought my next property, a foreclosure, in July of 2020 and I am just now finishing the rehab. I have a total of $10200 of my own money in all 4 places, plus 6 months of mortgage plus taxes and insurance in cash reserves. All 3 places cash flow, I believe the 4th will also. I am now 63.
The moral of the story is in order to do this you need to remain conservative. Cash reserves for a cushion is imperative. Look for deals off market and walk if they don't cash flow nicely. Never fall in love with a property, it's just a means to an end.