How to Prune prickly spindle?
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.

prickly spindle · Euonymus aculeatus
Grow in well-drained soil in partial or full shade; grow in full sun if soil is moisture retentive. It will climb vigorously if supported and is ideal trained against a shady wall
Usually little pruning is needed. Lightly shape if necessary, removing dead, damaged or diseased shoots. Prune after flowering.