Here's a big spot that needs patching.

For patches I sacrificed a pair of jeans that were in worse shape. I cut a piece about a centimeter or two larger all around, and laid it out with the texture running the same direction.

Flip your pants inside out.

Use pins to tack the fabric into place. I only used a few because I'll be repining it on the other side so that I can see the pins as I sew. I will then remove these pins.

I flipped the jeans right side out again and repined on the outside so that I could see my pins. I pulled out the other pins from the inside as I went.

Take this plastic piece off of your machine, it makes the job easier.

Sew around your holes, close to the damaged area, removing the pins as you approach them.

It's hard to see b/c my thread is a good match, but I followed the shape of the holes.

I always take it off the machine after doing a section, I back stitch to lock my work into the fabric, then adjust my fabric & begin again in a new area. Lining up my stitches so you can't tell.

Here's my progress. I have one small area to stitch (yellow pins) then I'll meet my stitches up back where I began.

Flip the jeans inside out again, check your work for any spots you may not have stitched together ( I missed a spot). Cut off the thread tails and trim up your patch.

Here's my patch after I trimmed the extra fabric from the edges. Don't get too close to your stitches. It will fray & you don't want to have to mend your patch again.

It doesn't have to be neat. Repeat the lines as many times & as close together or apart as you like. This adds extra strength & style. This is what you've been paying $70 for at the shops. Crazy kids!

Here's the hole after I finished mending it. For smaller holes you can use the same technique but patch with interfacing, and just make more lines of stitches across.