Given the amounts involved, is filing this on my own really the right approach?

Handling the initial complaint drafting and filing yourself, or with document-preparation assistance, is a genuinely reasonable approach for getting your case formally started, though it's worth going in with realistic expectations, since sellers named in these cases are usually either insured through a homeowner's policy or otherwise represented by counsel, meaning you should generally expect a genuine, actively contested defense in response rather than a quick, uncontested resolution.

If your repair cost estimate turns out to be substantial, interviewing a couple of real estate litigation attorneys before committing to handling the entire case yourself is worth the time, since some attorneys will take on a strong, well-documented non-disclosure case using a hybrid fee arrangement, a partial contingency or reduced hourly structure, that could ultimately end up costing you less overall than managing the full litigation process entirely on your own from start to finish.