Do I really need Desoldering for replacing resistors/caps?

I use Weller, but it’s hard to find. Had purchased mine 10 years ago 4lb.
I would not recommend neither tin or ones with silver added. Make sure you're bellow 200-Celcius range of melting Will be impossible to work and will require high heat which you often don’t want to use on circuit boards.

Thank you very much czarivey. Really appreciated your help Sir.
Eddy

You could get manual desoldering pump for $4.50 or solder wick 
http://www.parts-express.com/Search.aspx?keyword=solder%20wick&sitesearch=true
Kester #66/285 is a proper solder - eutectic Sn63/Pb37 is the best for small electronic parts while 285 flux is mild and can be left on the board.

Agree with kijanki.  Unless you were going to do a massive amount of desoldering, a pump and desolder braid, work just as well and costs much less.

http://www.amazon.com/gp/product/B0019V5MAC?keywords=desoldering%20wick&qid=1456936131&ref_=...

Above is by far the best desoldering vick I have come across.

Best of Luck

Peter