You can get some decent pics yourself and there is nothing wrong with going with a professional or a hobbiest.
Lighting is almost always the the key to achieving good shots. As mentioned the golden hour is a good time but you can also reproduce that with lighting. When you set up you want more light than you think that you will need. If you are using lamps then have one that will face straight at your wife. Then set up a few or one that is much stronger than your first one as your directional lighting. This will be set up to the side, above, below, etc. Most of the boudoir shoots will use a lot of directional lighting or the magic hour natural lighting which is directional. When using the lighting move it around quiet a bit because the effects can vary a lot.
When doing set up be sure to unclutter whatever space you plan on using. Flat or empty space works well if you are seeking to focus on your wife. You can go as simple a king size sheet or two to block out some space or make a backdrop. Think about a lot of the studios that you see. There will be a simple backdrop and perhaps one prop or two. Make sure you don't have anything in the picture that will distract from your objective. Take a little time to set up the areas you want to shoot in.
Doing photos can be a lot of fun together. When getting a photographer be sure to treat it like you would any other date. Meet them first and be 100% sure that you all are comfortable with them. There are a few in the LS and it is probably your best option to begin with. Most boudoir focussed guys will be fairly expensive. It would be some where in the neighborhood for what you would pay for a small wedding in your area. Pricing tends to be regional. The big issue is being sure you keep the rights to your photos, assuming discretion is an issue. You may or my not want your wife's pictures being used to promote their business.
Good luck and have fun.

