I am looking for insights if I should perform a DIY cost seg or if I should work with a firm? 

Licensed Real Estate Broker owns a Realty One Group Franchise and also owns a Property Management firm servicing Queens, Brooklyn, Bronx and Long Island

It will usually give the conditions for the return of EM.

James Funnel, Jr. with the firm Brody Wilkinson PC.

One of the main things you get from TC and I get these e mails when I am selling and the other sides TC contacts me and says  Hey we need that lead paint disclosure or we need the property disclosure  or if we are buying Hey where is your EM  all the little details .

If you have time on your side and flexibility in your schedule I would suggest finding a local firm that you can intern or work for.

I am graduating from law school in May and will be practicing real estate law for a law firm in Philadelphia, serving mostly large commercial clients.  

Pretty informative for someone just getting into this...https://kimandbagwell.com/pitfalls-for-the-inexperienced-geo...And on another thread (https://www.biggerpockets.com/forums/61/topics/1152882-tax-d...) there was an interesting point made by @Sam Bagwell (I wonder if the above is his firm -- likely)... if you engage an attorney to handle the debarment and the property is redeemed, you can end up upside down even with the 20%.

Although that is pretty much standard with Any wholesaler but especially so with this firm..

You could turn the matter over to a collection company (including law firms that do collections on contingency), but normally, they charge a very high percentage of what they recover, and you normally have to authorize them to settle for any amount the want to.