Just be careful,don't sign anything until the sale amount is not distributed. Receive the sale amount in cash first and balance by amount by cheques and promissory notes . If you did not received the amount then while appearing for registering authority you can refuse and clearaly make a statement that you did not received the money. Don't let sale proceed until the shares cleared.
Secondly read each document and don't sign any of you any kind of bland stamp paper,or power of attorney or any document that is other than sale dcoument,
if you need to hire an advocate for that then do hire for protection.
Otherwise your next quieries would be in lots and that wont have any solutions at all.