I have found with this it is about managing client expectations.  I am not a finish carpenter, plumber, or an electrician nor am I someone who will take a job renovating your bathroom, kitchen, or basement.  You can always ask to make sure, but don't expect a yes in these areas.  

It is extremely important that you review the contract in full.  If something is not listed on there, it isn't on there because I am not responsible for it.  It is also very important that I will only obtain necessary building permits.  I will not go before conservation commissions, zoning boards, health boards, shed registration, historical commissions, or anything else nor do the research if it is required.  Every municipality is different and that is solely your responsibility.

An example would be you want a chicken coop built. Great! I love chickens and can do that for you.  The invoice and contract list materials, dimensions, caveats, and assembling.  If I arrive to find where you want it to be unsuitable for building either because of the grade, soil, or generally unsafe, the contract is postponed until its rectified, cancelled as site preparation was not included in the contract with deposit and any reimbursement of any items that cannot be returned, or built with new contract addendums.  Alternatively, everything is perfect and ready but it is near a protected wetland and your municipality shuts down the build.  You will be responsible for dealing with the town and the balance of the contract should I not be allowed to continue.

Why would you risk your sanity and the relationship with your significant other attempting to put together furniture together?  You can have me come do it for you while you kick your feet up and bond.  Additionally, if something goes wrong, you can join together against me making your relationship that much stronger AND I'll have to fix what I did.  You can't lose!  No really, you will fight with each other.