We do offer financing through Paypal Credit. You can choose that option during checkout and they do offer no interest payments. No interest if paid off within 6 months on purchases of $99 or more.
These come as kits.
Most customers assemble these items themselves (and the owner's manual is available if you'd like to take a look at it).
If you do hire out assembly, we recommend finding a local handyman through mobile apps like:
Takl, Angieslist, thumbtack and Homeadvisor
We have also found that customers are far more successful at getting more competitive local assembly/installation rates if you join a local facebook classifieds group and create a post like, "Looking for a licensed and insured handyman to assembe my ......."  You are likely to get several competitive bids eliminating the middle man.