Ok, I'm not exactly a "new" guitar player - however, I've never really taken lessons for over a few months, or taken it too seriously learning myself.

Here's the problem - Standard Tuning always starts to bore me, and I switch to dropped-D, and sometimes move that down 1/2 a step or a full set.

Problem - you probably guessed it already (and given the title), my intonation is now completely out of whack.

I'm going back to standard, and I'm going to try to take it seriously and learn my stuff - so I'd like to set it back. Is it easy enough to do, or should I take it in? I really don't know what it'd cost.

I have an Ibanez RG - it has the lock at the neck, and a floating bridge - I don't know if that makes a difference. I've got a key, so I can move the little things that hold the strings, back and forth. From what I recall - I need to fix it so that the length of the string from frets 1-12 and 12-to something are basically the same length right?

I was just checking my tuning and here's how it goes. Going up one fret on the bottom string I go from

E - F - F# - G (a little flat now) - G# (little more flat) - A (even more flat) - by the time I get to the 12th fret, my notes are constantly flat. My tuner says around -25cent, whatever that means - but it's pretty flat.

I can look around online and find little lessons - but I really prefer person to person, because I get better instructions and I can ask questions!

I only have a basic account on here, so I can't go to many links.

Anyway - I'm hoping it shouldn't be too hard. Any help is appreciated - if I should do it with new strings on, or without strings (a lot easier) and just measure, etc, etc. I've never really done it (although I have a basic understanding).

Another thing: when I go to where the strings go in, they are small metal clip like things. Closer to the pickups, there's that little screw type thing, when I losen it, I can move the clip back and forth that way - I assume that's what I need to fix.