I'm new to casting myself, probably close to 6 months now. I cast with the same mold that you have TL358-158 SWC except it's a double cavity. I have both the SWC and the round nose (tumble lube type). I posted some photos in the Bullet photo's thread. I size all my bullets, although I have been told it's not necessary. I bought my sizing die from Kempf gun shop web site
http://www.kempfgunshop.com/. Search for Lube and sizing dies. I just checked and they go for $15.95 each (you have to select the caliber) plus some shipping. The kit comes with the sizing die, a red container that sits on top of the die (to catch the bullets) and a 4oz bottle of Alox lube. It's a family owned business and Sue Kempf gives the best customer service after the sale. I also bought a Lee reloader press $24.95 to use exclusively for sizing bullets. It's not a heavy duty press, but perfect to use for sizing. Well worth the money.
If your bullets stick, smoke the mold. I lite a wooden match and let the soot coat the inside of the mold. Works great.
Take care, Citywaterman