Good night

I want to add to a wishlist counter in the outer-header menu.

The only way I was able to do this is by changing the header: menu-header.php file (includes / partials / header / header-menu.php) and adding "

Is this the right way to do it?

Another question, I need to change the "search", "user" and cart icons of the outer-header menu.

I added the following CSS to this:

#nectar-user-account .icon-salient-m-user
{
background-image: url(https://gkgo.pt/pusilidesign/wp-content/uploads/2019/03/icons-superiores1.png);
background-size: 25px;
    background-repeat: no-repeat;
}

#nectar-user-account .icon-salient-m-user:before
{
visibility: hidden;
}

Is this the right way to do it?
Will not I have performance problems?

Best regards