So your thinking of using a DTR device but are unsure where to start.

To use the DTR or Retainer device some shaft skin is needed. The more shaft skin available the better.

Almost every man that restores starts with a CI 1 or 2 on average , Consider yourself very lucky if you have more than a CI-2 when you are starting.

glans width
Frenulum
D battery

You can test to see if you can roll any shaft skin onto a restoring device by using something close to the size of the device you are thinking about using.

Example: This D battery is a little more than 33 mm in diameter.

D battery roll

If you are able to push or roll any shaft skin onto the object this will give you an idea on what you have to work with when you start.

Check out the G.T.S.R page for more info on glans to shaft anatomy

finger pull foreskin stretching
finger pull foreskin stretching

Manually stretching the skin is also another way to start.

Loosening the skin is the first step in the process and this normally takes only a few days to a week making using a restoring device an easier to do.

I had trouble when I start to restore for the first time. It can feel awkward at first. You will get erections when trying to attach a device. This happens to most of us. After a few days my body became used to the idea of having something attached to it. The erection issue when installing a device diminished as will the awkward feeling of having something attached to my penis.