Gain a visual conception of each scale pattern by examining a scale pattern diagram, which will tell you what frets to play on which strings in each area of the fretboard. Seven different positions exist and once you have mastered them, you can slide the pattern to a different starting note in a different area of the fretboard and change the scale you are playing without changing the pattern that your fingers are playing.
Form a mental map of the scale in your head without playing it and visualize where each of your fingers will go before you play the pattern. Conceiving of a scale pattern in this way is especially helpful, as the guitar is not a visual instrument.
Look at the fretboard and place your fingers on each fret, as indicated on the scale diagram. While you do this, recite the names of each note and pay special attention to the root note, (The note contained in the scale name, C Major = C; B Minor = B) of each scale and its location on the fret board.
Play each scale in every area of the neck. Because the patterns vary in each location, play each scale slowly to get a feel for the fingering and sound of each one. Identify the notes and their sequences in the scale, again paying attention to the root note.
Memorize the sound and structure of each scale pattern as you play it and associate the pattern with the scale's appropriate name (containing the root note) in each position of the neck. Play the scales in their entirety both ascending (increasing in pitch) and descending (decreasing in pitch) to develop fluency; get the sounds and patterns in your head.
Identify the scales aurally. Hear the unique interval structure (distance between notes) of each scale and how it sounds played in different locations on the fret board. Associate each sound with the scale's name; play the appropriate scale upon hearing its name and recite the name upon hearing the scale.
Play each scale in seven positions and locations on the fret board in different sequences. Begin playing halfway through the pattern and continue; begin from different notes and frets in the scale, playing in different directions, both ascending and descending, and discover as many ways as possible to play the scale to maximize fluency.
Connect corresponding scales in their seven respective positions on the fret board to create a map of the scale across the entire neck. Jump from position to position comfortably and play any scale in any position on any area of the neck.
Practice your new found ability to play scales up and down the neck by improvising a solo within a certain scale using all seven patterns. Use different areas of the fretboard as practiced and employ ornamentation (sliding into a note from a lower or higher fret, bending the string, etc.), dynamics (alternate the volume at which you play) and different rhythms throughout.