Speaking as someone who does this everyday as part of her job, let me make a few suggestions.
1. Get the clippers out and keep them handy. When your beag is tired out and lying down, get on the floor with her and speak calmly. Have one person scratch her behind her ears and the other person do the clipping.
2. do the back feeet first.
3. Make sure teh clippers are SHARP. If you are nervous, so will your beag. just clip the tips and every toe, praise her and give her treats. 4. If you do quick her don't panic. Use a bit of cornstarch or flour as styptic.
I have seen it time and time again, the owners swear they fight and fight it at home, and the dog comes in and we snip snip with nary a peep!
There are a couple of different kinds of clippers, the standard and some that look like a scissor, I can't remember the name.. they have a stop so you can't clip too much off at one time. Those are the kind I prefer.
You can always use a dremel tool. My basset was a horrible fighter, even wanting to bite. I went slowly on her and I think the pressure of the clipper was what was freaking her out. (Press on your nail bed as hard as you can with your thumbnail and see what I mean) I used a dremel and I could grind down to the quick and she never flinched, and after a few times of this I was able to go back to regular clippers.
If all else fails just take her to the vet. They won't think less of you and it makes them the bad guy, not you. Long nails are very bad, as they can grown into the pad or twist the toes and be extremely painful. The goal is to not hear them click on the floor.
Good luck!