Make sure you know how to deal remove and dispose of ticks before your pet gets one. The easiest way is to buy a tick removal product and take it to your local groomers or vets and ask them to show you how to use it.
If you do know already, then still make sure you wear gloves while removing and disposing of them.
If you are squimish and don't feel up to rmoving the tick yourself then take your pet to the vets asap to have the tick removed. Do NOT wait for the tick to drop off. Ticks can harbour bacteria harmful to pets and humans so get them removed as soon as you see them.
You can read about Lyme Disease here:http://www.nhs.uk/conditions/Lyme-disease/Pages/Introduction.aspx