I haven’t used that one but they are all pretty much alike. I’ve used the one I mentioned above and it was easy to implement but the main problem was using it on hidden elements as it didn’t initialise so you had to show it first then initialise it then hide it. Otherwise it worked pretty well but be aware that many users don’t like the scrollbars being changed although aesthetically it does look more pleasing in some cases.
Is it possible to use “sticky header” plugin with inital fixed header like I have now?
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I’m not sure what you mean exactly. If you only wanted to fix part of the header such as them menu (to make the page height less) then you wouldn’t need a fixed header to start with because you want it to scroll away and just leave the menu.
It may be worth you just creating a rough demo page with the header in place and try these things out in isolation so that you don’t mess up the existing site. That’s what I usually do when I’m trying to get something to work and to see if its useful before implementing the finer detail.