Mcintosh C2600 preamp tube upgrade


I recently added the new McIntosh C2600 tube preamp to my system. It's paired up with the MC452 power amp along with Sonus Faber Elipsa speakers and Transparent interconnects/speaker cable.
I"m looking for some guidance with regard to upgrading the tubes in the C2600. Should I, or shouldn't I ? 
Also, what brand should I look for and where should I buy them. And finally, is this a diy upgrade or should I have it done at a audio shop? 
I appreciate any guidance all you audiophiles can offer
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Tried the Gold Lion 12AX7 tubes in my McIntosh C2500 preamp.  Listened for a week, liked the McIntosh branded tubes much better. I bought the a gold Lion tubes from Upscale.  They were rated “uncle Kevin’s personal stash”. Which are their most expensive and lowest noise.  If anyone is interested in them, send me a PM. I am not planning on listing them, too much of a hassle. 
@jeffinnh76,       If you are looking to make the line inputs sound better(cd player/dac, music server) put them there. If you want to do the moving coil or moving magnet input, put them there.  Refer to your owners manual which will show you what tubes go where.  It is also marked on the tube strip once you take the cover off to change them. 
Noob question: do I put one of each: 12ax7 & 12at7 in place of the stock tubes? 
Read your manual, that is what it's for.  If you don't have the manual, you can download it from McIntosh for free.

MY C2500 uses 6 12AX7 tubes.  It does not use any other type so I can't help you.