The important thing to remember about latex is that is is designed to be extremely tight, meaning it's not always the easiest garment to get in and out of.
The best thing to do is give the inside of your catsuit and your body a generous dousing of talc before getting into it. This will help the latex slide over your skin without sticking. You can use lube to help get it on, but talc lasts longer and helps to miniminse sticking and sweating.
Latex is matte when it arrives, so you will need to shine it with a latex shiner or silicone based lube to achieve the shiney wet-look you're used to seeing.
When you first put your catsuit on it will probably feel too tight - but don't give up! After about 10-15 minutes you'll notice that the latex will have warmed up and relaxed, giving you the perfect fit!
When you're finished in your sexy getup, peel it off and wash it in warm soapy water, then rinse and leave to air dry :)
Don't forget that a latex catwuit will be completely different to 'wet look' or 'PVC' so be sure to check the material before purchasing.