Hi Neo
I sometimes use DBGDGD when playing. As you probably know, the same chord can be played in many different positions on the fretboard. The 'trick' is to find the chord position that takes the least effort, taking into account what octave you want your 'dominant' note in. This leads to some very interesting chord positions, a lot of which can then be modified to suit the different nuances of the tune/song.
Whether you are on a run up the board, or down, a G banjo player once told me, it is important to make the transitions between chords as fluent as possible.
This can be achieved in quite a straightforward way.
Find your 'start-off' position/chord.
Without moving the position of your fingers, move the hand up the fret-board one fret at a time, and listen for something that is close to what you have in your mind. In order to find that chord, you may have to adjust a little your fingers. That's OK, you may have to replace one finger for another on a different string, as long as the transition time doesn't affect too much th fluency. If it feels too much then find another combination.
I am assuming here that you do use a 'G' tuning like the one I am talking about, (minus the bass D, of course)
This tuning, beloved of bluegrass pickers, is designed to enable the chromatic progression, and digression, of chords. It's the same rules that apply for the guitar.

However, if the tune is in a key other than 'G', a capo is the simplest way out. The same rules apply of course, except 1 or 2 etc frets ahead.
After that, as everybody else has said, just keep at it, slowly, slowly, gradually as your confidence in your fingers, and their new positions, increases, it will come. It's a bit mantra-ish.
I'm sorry if none of what I have written makes any sense; but it's quite difficult to explain something when you don't know how to explain it.

le grá

Breandán