Siz, do you have MS picture manager? If you have MS Office, it is one of their features, and you can do many basic but useful manipulations in a very simple, easy way.
To simply resize, go to "Edit" at the top (4th selection from the left), click then go to resize. On the right hand side you will see a section where you can enter the desired size, you can either enter pixel size or go by percentage of the original size. Just get it to something like 600x800 max, or maybe 480x600... it will show the actual size of the picture as you modify it so you can decide how big or small you want it. then click okay, and save it using "save as" (be careful, if you use "save", it will resize the original file, what you want to do is making a copy which is resized.), renaming the photo, perhaps adding "resize" or "small" to the original title, then selecting either jpg or gif.
This is a start, if you are absolutely new to it... I will give you a link to a basic tutorial, I hope it will help... but perhaps if you can wait your hubby can explain you better... but come on, give it a try, maybe you will impress him!!
MS picture manager quick tutorial