Kitchen sink taps are particularly awkward because they are behind the sink znd against the wall. Unless you have four hands, and fingers two foot long, it is easiest to take the sink off, turn it upside down, and fit the tap, then connect to the pipes when you have put the sink back. It is essential to turn the water off at the stopcock and run both taps dry before you start.
You might do better to dismantle the tap from above, take out the ceramic cartridges, and order new ones to replace them. Plumbers merchants hold a reasonable range, but unbranded imported taps may be peculiar. Once you know what you need, tap specialists like Lynn's can match it.
The PTFE tape is a seal. It is not put on the threads of a joint. It is put on the olive, which is a brass or copper ring that is squeezed between the compression nit, the pipe, and the olive-shaped recess in the fitting.
The bonding wires can go anywhere on the two pipes (plumbers mistakenly think it is an electrical requirement, but it is just an old plumbers tradition). The incoming cold water supply is supposed to be bonded to the earth connection where it enters the house.
Frankly, if you are a beginner of any sex, and have not started out with some easier plumbing, and worked your way up to it, I would not start with a sink tap. You will probably get it half-way apart, with water running down the wall, and be unable to get it back together.
Try to find a local professional plumber, preferably a wrinkly old person with blue overalls. Ask friends and neighbours for a recommendation. Look in the parish magazine for somebody who has been advertising for years. Ask at the gardening club or the community centre. Ask at the plumbers merchant. Ask other building trades if you know any.
Semi-retired people often like these little jobs.
"Which Local" is a good source.
If you have ample funds, a gas boiler person can do it, if they can be bothered.
Online searches are a very poor way. The websites that charge the trader are advertising sites, not recommendation sites. If there is a freephone number, or a non-local number, do not use it.