Just trim the fabric to the desired hem length plus one inch, then overlock around this raw edge with thread close colour match to the fabric.
You then have the choice of either stitching around with a stretch stitch on your sewing machine, or hand sewing.
Being lycra shouldn't change how you hem them unless the trouser leg is extremely close fitting and the hem seam is going to be under tension.
My first choice would be using a twin needle in straight stitch from top side but this finish can pop/break if the hem is under tension. But perfect for most knit hems.
If you hand sew then you can turn up hem allowance and put a length of fusible hemming web inside the hem allowance and press it to hold. Then do a back stitch hand sew around to hold hem in place.
If you sew with the regular sewing machine, then use either the stretch stitch or a very small zig zag, and a ball point or stretch needle.
On ready to wear you would see a coverstitch hem but your overlocker doens't have this stitch.
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