Some providers (myself included) won’t send free pictures as confirmation, but instead will point you in the direction of their reviews, websites and social media platforms (if you haven’t already done so). You can usually find review & website links on LL in the provider’s ad description, or linked underneath the description as well. To reiterate what was said above, other providers may require a deposit to secure their time as it’s been wasted in the past, but if they have reviews & websites dedicated to their business, paired with a good reputation, you should feel comfortable that they are legit. The most important thing to remember would be to do any research you can on the provider you wish to visit before contacting, and to make sure that you are being clear in explaining what you are looking for during your visit. Don’t hesitate to ask questions either! Communication is key in determining whether or not someone is considered “too good to be true”.
Wishing you goodluck & lots of fun!