You won't know until you try it! But if you're at all curious about parties and maybe have watched orgy porn, I'm sure you will enjoy it.
There are quite a number of providers at various ratios & pricepoints and good advice would be to try different ones to see what suits. A bit like breakfast cereal, you can choose the expensive branded one or go for the value option which might taste acceptably similar depending on your budget. Cheaper options tend to have higher ratio of guys and less attractive girls.
My first party was an LMP about 3 yrs ago and I haven't looked back since. I haven't followed my own advice and tried anywhere else personally. I found it worked for me and it's now my main source of punting...you just can't match the variety and VFM compared to 1-2-1 punting.
My main apprehensions were:
Would I cope with seeing other guys naked?: You just focus on the girls and their reactions, just as in porn where you see other cocks doing their job.
Would I 'perform' in that environment?: No-one is examining your performance critically, it's easy to excuse yourself and move on if things aren't working out. The girls do a great job in extracting a good 'performance'...just relax!
Would I feel out of place? Well, you will be nervous the first time, inevitable, but there are all ages, shapes & sizes, just normal guys, so I doubt you'll stand out in a bad way.
Although you can't always achieve the same level of intimacy and some services might be off-limits, in the end it can be more fun being in a group sex situation, the girls seem more relaxed and ready to have fun and some of the banter between the girls, guys and female hosts is priceless.