The two earliest popular and successful “gurus” were Jimmy Napier, whose speciality was investing in notes, mobile homes, and real estate “exchanging”, and John Beck, whose speciality was tax auctions, and complex series of exchanges in which John used near worthless lots acquired for pennies at tax auctions at full tax assessed value for exchange purposes, usually as a downpayment, or as collateral for a private note.

Here are some popular skiptracing platforms and websites that investors often use:TLOxp: This is a service by TransUnion and offers a comprehensive database to find detailed personal records.Spokeo: Useful for basic information and sometimes provides email addresses and phone numbers.Whitepages Pro (now Ekata): Offers identity verification data, including phone numbers, addresses, and more.BeenVerified: This service aggregates information from various sources, giving you phone numbers, email addresses, and other details.PeopleFinders: Similar to BeenVerified, it pulls from various sources and provides detailed reports on individuals.BatchSkipTracing: Designed specifically for real estate professionals.

And once you've got an approved applicant, then you present them with your lease, which needs to be comprehensive in its protection for you and of your property (mine is 24 pages and counting as I encounter new issues, and it contains fines for certain violations) - check your state laws.

Trade school for plumbing is 2-4yrs, I'm not gonna take you from 0 knowledge to full comprehension on a web forum. 

These lenders are more flexible, especially if the property has equity and your credit and financial situation are solid.Here’s what you can expect: LTV (Loan-to-Value): The lender will typically assess the property’s current value and lend a percentage of that, often around 65-75% LTV for cash-out refinances.

A reserve is unnecessary, but I still keep around $15,000 - $20,000 in my account.The point is, that you should sit down and assess your finances to determine what the worst-case scenario may look like, how much you would need to cover it without impacting your life, and whether you will need to build a reserve.

As it has been said, you need to go and drive the area and make an assessment for yourself to start with. 

Although the majority of Michael's superb content on Cost Seg focuses on how to properly assess the value of Cost Seg, he also does highlight some items regarding the internal workings of a Cost Seg study.

Long story, it was through a real estate agent, but the owner determined his price assessment of $150K is correct, and the agent wrong.

I believe they do free assessments if you wanted to get a second opinion.