Keep names and shapes separate
A sounding C major chord remains C major on guitar, piano, or ukulele, but the fingering changes with the instrument and tuning. Do not copy the visual shape from a guitar diagram onto four strings. Also check whether the guitar chart uses capo-relative names. A guitarist playing a G shape with capo two produces A major, so a ukulele player needs the sounding A harmony unless the whole arrangement is being transposed. Resolve this distinction before learning the progression by memory.
Choose ukulele voicings for the actual tuning
Use ukulele diagrams suited to your instrument and play each chord separately. AudioChords offers instrument-specific diagrams that can help locate the shapes, but verify the tuning and the chord sound. A guitar slash chord may describe a bass line that is difficult to reproduce on a high-G ukulele. Preserve the main harmony and decide whether a different voicing, selective picking, or another instrument will carry the bass movement. You do not need to force every low guitar detail into the same register on the ukulele.
Rebuild the rhythm instead of shrinking it mechanically
Try the progression with a light, simple strum and listen to the vocal. A dense six-string pattern may become overly busy when transferred without adjustment. Use shorter attacks, selective strings, or deliberate silence to keep the arrangement clear. Test the entire form, including any bridge chords that did not appear in the first section. If you transpose for easier shapes, check the singer's range and tell other musicians the new sounding key. A successful adaptation preserves the song's harmonic route and phrasing while allowing the ukulele to sound like an intentional instrument choice rather than a reduced guitar.