I would try to build it but a bit of nerve when it comes to technical skills which I don't want to break the system myself. I have never tried before. However, Would you advise me the custom build system at $1000 usd budget ?
The parts you listed would come to around $750. Additional components (case, power supply, keyboard, mouse, Licensed Windows OS) can all be added for around $250. Again, if this is a new system, seems about right (provided all the additional components I listed are included). If it's used, no more than $500.