I hear you on this because I have many clothing items that got too big on me and many which I really liked but were hardly worn. It depends on where they are loose, as quiet ballerina
said. The first thing that I do is try to wash them on super hot water and then throw them in a laundromat hot dryer (they seem to be the hottest). If the jeans are 100% cotton they will shrink some although expect them to shrink in length too which may or may not be a problem for you.
Then, if you still want them tighter I would do a simple seam and take them in on the inseam. If you don't like a tight crotch then I would stop the inseam about 3" from the crotch on either side. So, again you would start at the hem and go up, stopping where you feel you still want some room. What professionals do is turn the garment inside out, pin it with straight pins then try it on. Then, you see how it fits. I would also sit down and also crouch down to see how you like that kind of fit.
If you are only wearing them around the house and in the yard, have you considered leggings? I wear these around the house all the time. Many have some spandex in them, which you may or may not like, and I see that they now offer fleece lined ones for the winter; which I would like to get one pair of those. If you are concerned about a lower tummy, you can always wear a longer top to cover that.
Good luck! Pam