For a mini neck lift, the only scar will be a 2 cm scar under the chin. This is usually very well hidden. For a standard face/neck lift, the incisions are around the ears. Again, these tend to heal very well.
Neck or neck and face lift scars heal very well. They are hidden under the chin and around the ears. The risks of poor healing are decreased if you are healthy and not a smoker. You have to decide how much your neck and lower face appearance bother you and if the answer is a lot the scars should be less of an issue. Based on your facial assessment, your surgeon will propose the extent of your surgery and could show you the results of his/her work including the scars.