王婆卖瓜，自卖自夸 Every potter praises his own pot.
Explanation: people are loath to refer to defects in their possessions or their family members
Example: 买房有价，装修无价，个中情况，自行斟酌，也不要听我‘王婆卖瓜，自卖自夸’，也不要自己‘一厢情愿，不管其他’，只有货比三家，才是为佳！！！