Hi Kiran,
Good to reach out to others for referrals, often that is a great way to find folks.
As for your question about which parts of a rehab might one do with a specific contractor rather than the General Contractor, i typically will use my preferred flooring company (Ideal Floors - 817-542-2331) to do the floors at the end. Also, one might want to handle a foundation job ahead of time separately - but you wouldn't have to.
If the GC is pretty busy, parcing out some of the major pieces of the job can sometimes help to offload some of the work so they can concentrate and coordinate the various trades jobs that will need to be done.
Using a GC for the other trades (Plumbing, Electrical, Painting and other misc. items), can shorten your timeline because it is all under "One Roof" - or one boss organizing the timings...and his guys probably are used to working around each other - and GC's, like Blake of Finising Touches, have a lot of the details ironed out ahead of time because they do it all the time.
When you are just starting out, using a GC can help things go a lot smoother for sure!
Hope that helps a bit.
