How not to mess up a customers SQL Database? : next week I will create some simple Select Queries for PowerBI for a new customer who wants to have more insight in his business.

Until now I have only done this for our own company. I am afraid that by installing the SQL Server Management Studio and building some queries in Management Studio I might (in a freak accident scenario) damage his database. I know this is unlikely.

However I do not really want to mess with his configuration. I also do not want to give him any ground to argument against me if anything unrelated does not work afterwards.

What would be a reasonable way to get my queries without really touching his database ? I thought of using a 3rd party frontend like Heidi SQL or FlySpeed SQL (even better because you cannot do admin tasks with it). I cannot just start with PowerBI because I need to analyze his DB first (scroll through tables etc).

Also I thought of making a backup of his DB first but that involves playing around with Management Studio. 

Thanks in advance for any suggestions!
