Large Coin Collection - Inheritance - Help/Thoughts Wanted

Dear all,

Due to the recent passing of a close family member, we have inherited a large coin collection of over 15.000 unique coins and tokens.
Essentially, it was his life work, containing coins from all over the world; all countries, all types,.. but mostly Europe - and Germany.

We've considered continuing collecting coins, however, no one has the time or passion for it.

Since it's quite pointless to have such a large collection without doing anything with it, we have decided to sell the collection, even though that this might be a sad thing to do. On the other hand, we're going to add all the coins to Numista, to have a digital copy.
 
Now, we have several questions regarding the selling of such a collection:

General questions:

1. What is the best way to appraise the value of such a collection?
2. In case anyone has experience with selling a collection, do you have any tips or things we should definitely think of?
3. Is there some value attached to having a collection like that, apart from the value of each individual coin?

Specific questions:

1. Apart from “normal” circulating/commemorative coins, the collection contains quite some silver and golden coins. Examples: N#356585">ex1, ex2,  ex3. How much are these coins generally worth? More or less the price in silver/gold nowadays ? Or is the price is a bit higher due to being a collector's item? For each one, we're trying to do our research and check prices online, but still, any guidance is welcomed.
2. Should we have certain golden or silver coins authenticated or graded before selling them? Does this matter (a lot)?
3. What about circulating coins? These probably go for the billion value?

FYI: we live in Belgium.

Apologies if these questions can come across as stupid, but we'd like to clarify as much as possible before selling anything.
Thank you in advance.

Cheers

talk to your friends who have found themselves in a similar position. they could possibly link you to an trusted dealer. You will then have to get them to visit your residence to appraise the collection. It is much too large to move around. It is not impossible for you to appraise the collection but an experienced person will be quicker to grade and value the coins. Grading coins is an art and will always bring differences of opinion. 

I have kept most of my mother's collection especially the pieces that I can link to our family history.  I have gold coins that were given to my grandfather when  she was born. One of them I passed onto my niece on the birth of her first child with the story of its origin and I let my niece know that she is the guardian of it until her daughter is old enough to understand its history and can make her own decision what to do with it.

There are physical, collecting and emotional values for all collectables.

For a collection of that size you really need a professional to look at it. You need to feel comfortable with the person doing the evaluation too. I have done a few for my friends but if it is too big, or too many pieces I am not comfortable with, I guide them to a dealer I trust. 

Cataloging here will give a guess at its value but 15,000 coins will take a long time to enter. I would be surprised if your relative did not have a listing somewhere.

good luck, my advice is a trusted dealer that you are comfortable with.