New to DIY audio but interested

Just recently signed up to this forum to hopefully get some pointers in upgrading a Creek OBH-11 headphone amp i just bought. It's working just find but i've seen that there are some upgrades that can be done so i'm now interested in trying this.
 
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I would use it for an extended period with more than one set of headphones before attacking it to modify it. Until you know it's sonic signature you may be wasting your money on the upgrades even if others say the mods are a night and day transformation. There is also expectation bias associated with any DIY upgrades.
 
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